Accidental Discharge

ăk′sĭ-dĕn′tl  -  dĭs-chärj′

The event of a firearm discharging (firing) at a time not intended by the user. An unintended discharge may be produced by an incompatibility between firearm design and usage, such as the phenomenon of cooking off a round in a closed bolt machine gun, a mechanical malfunction as in the case of slamfire in an automatic weapon, user induced due to training issues or negligence, or a simple accident.


An unexpected and undesirable discharge of a firearm caused by circumstances beyond the control of the participant(s) such as a mechanical failure or parts breakage. There are very, very few firearms related "accidents" and if the "4 Rules" are followed there will hopefully be no injury.

Accidental Discahrge Accidental Discahrge                                                                   Glock Accidental Discharge Glock Accidental Discharge

ACP Automatic Colt Pistol
.45 ACP

Stands for "Automatic Colt Pistol." Used to designate certain cartridges first chambered in Colt automatic pistols--.25 ACP, .32 ACP, .380 ACP, .38 ACP, .45 ACP















AAC                       Advanced Armament Corporation

AAR                       After Action Review

ACC                       Remington ACCelerator

ACOG                    Advanced Combat Optical Gunsight

ACP                        Automatic Colt Pistol

ACR                        Adaptive Combat Rifle (Remington)

ACS                        Adaptable Carbine/Storage

AD                          Accidental Discharge NO SUCH ANIMAL! See ND

AE                           Action Express, i.e.; .50 AE

AFA                        Armed Females of America

AJHP                      Aluminum Jacketed Hollow Point

AK                          Avtomat Kalashnikov/AK47/AK74

AO                          Adjustable Objective

AP                          Armor Piercing

APFSDS                Armor Piercing Fin-Stabilized Discarding Sabot

API                         Armor Piercing, Incendiary

APT                        Armor Piercing, Tracer

AR                          ArmaLite Rifle, AR-15

ART                        Adjustable ranging telescope

ASA                        Australian Shooting Association

ATM                       At This Moment

AW                          Assault Weapon

AWB                      Assault Weapon Ban

ACP                        Automatic Colt Pistol

ACP                        Automatic Colt Pistol

AD                          Accidental Discharge

AE                           Action Express

AFA                        Armed Females of America

AMP                      Auto Magnum Pistol

AP                          Anti-Personnel

AP                          Armor-Piercing

APCR                     Armor Piercing Composite Rigid

APDS-T                 Armor-Piercing Discarding Sabot, Tracer

APFSDS                Armor-Piercing Fin-Stabilized Discarding Sabot

AP-I                       Armor-Piercing Incendiary

AUTO                    Automatic Colt Pistol (same as the "ACP", not to be confused with "10mm Auto")

AWARE                 Arming Women Against Rape and Endangerment


BALL                      Ball Ammo/FMJ/TMJ

BAR                       Browning Automatic Rifle

BATFE                   Bureau of Alcohol Tobacco Firearms Explosives

BBL                        Barrel/Bull Barrel (Rifle barrel that is thicker than the normal hunting rifle barrel)

BBWC                    Bevel-Base Wad Cutter

BC                          Ballistic Coefficient

BCG                       Bolt Carrier Group

BCM                      Bravo Company MFG

BFH                       Barrel, Forged, Hammer (BFH)

BG                         Bad Guy

BHP                       Browning Hi-Power/P-35

BM                         Bushmaster

BMG                      Browning Machine Gun

BOB                       Bug Out Bag

BOD                       Born On Date

BOF                        Bureau of Firearms

BP                          Black Powder

BPCR                     Black Powder Cartridge Rifle

BPE                        Black Powder Express

BPV                        Bullet Proof Vest/Individual Body Armor

BR                          Bench Rest

BRR                        Bench Rest Remington

BT                           Boat Tail

BUG                       Back Up Gun


C&R                       Curio & Relic

CAL                        Caliber

CAR                        Colt Automatic Rifle/CAR-15

CARL                     Curio and Relic License, 03 FFL

CAS                        Cowboy Action Shooting

CB                          Cast Bullet

CC                          Concealed Carry

CCL                        Concealed Carry License

CCO                       A 1911 Classic Commander slide on an Officer frame

CCP                        Concealed Carry Permit

CCRKBA                Citizen's Committee for the Right to Keep and Bear Arms

CCW                       Concealed Carry Weapons

CF                           Centerfire

CHL                        Concealed Handgun License

CIII                         Class III FFL - dealer of NFA firearm

CL                           Remington Core-Lokt

Clip                         A strip of metal that is used to hold cartridges together to facilitate the loading into an internal rifle magazine.

CLP                        Cleaner, Lubricant, Preservative

CMP                      Civilian Marksmanship Program

COA                       Citizen(s) Of America

COF                       Course Of Fire, shooting stage in pistol event

COG                       Center Of Gravity

COM                      Center Of Mass/Center Mass

CPHV                    Center to Prevent Handgun Violence

CPL                        Concealed Pistol License

CQ                          Close Quarter(s)

CQB                       Close Quarter(s) Battle

CQC                       Close Quarter(s) Combat

CRL                        Curio and Relic License, 03 FFL

CTR                        Compact/Type Restricted

CUP                       Copper Units of Pressure

CWS                       Cold War Shooters


DA                          Double Action

DA                          Double Action

DAA                       Double Action Automatic

DAO                       Double Action Only

DCM                      Director of Civilian Marksmanship

DD                          Daniel Defense

DEWC                    Double Ended Wad Cutter

DF                          Drop Free

DGI                        DIRECT GAS IMPINGEMENT

DI                           DIRECT IMPINGEMENT

DPICM                  Dual-Purpose Improved Conventional Ammunition

DPMS                    DPMS Firearms, LLC/Defense Procurement Manufacturing Services

DROS                     Dealer's Record of Sale

DVC                       Diligentia Vis Celeritas - Latin for Accuracy, Power, Speed


EAA                        European American Arms

EDC                       Every Day Carry - Knife, gun

EDM                      Electrical Discharge Machining

EDW                      Every Day Wear

EMP                       Enhanced Micro Pistol - Springfield Armory

EOP                        Elevated Optical Platform

ERC                        Extended Range Carbine


FA                           Full Auto

FATS                      Firearms Training Simulator

FC                           Forcing Cone

FCG                        Fire Control Group

FFL                         Federal Firearms License

FMJ                        Full Metal Jacket

FML                       Fully Metal Lined

FN                          Fabrique Nationale d'armes de'Guerre/Flat Nose

FNH                       Fabrique Nationale d'armes de'Guerre (National Factory of War Arms)

FOB                       Forward Operating Base

FOID                      Firearm Owner's Identification Card

FORS                     Front-Opposite, Rear-Same (Sight adjustment mnemonic.)

FOV                       Field Of View

FP                           Flat Point / Firing Pin

FPS                         Feet Per Second/Firing Pin Spring

FS                           Front Sight/ Full Size (5" Government 1911)

FSB                         Front Sight Block (Gas Block)

FST                         Front Sight Tower / Winchester Fail Safe Talon (Black Talon)

FTE                         Failure To Eject

FTF                         FireArms Talk Forum/Failure To Feed/Failure To Fire/Face To Face (sale)

FTN                        Failure To Neutralize - penalty

FTRTB                   Failure To Return To Battery, slide fails to return a new round from the magazine to the chamber and lock

FUBAR                  Foobared Up Beyond (All Recognition/Any Repair)

FATS                      Firearms Training Simulator

FFIT                        Fast Female Incapacitation Technique


GA                          Gauge -shotgun bore diameter

GAP                       Glock Automatic Pistol

GC                          Gas Check

GCA                       Gun Control Act (of 1968)

GDHP                    Speer Gold Dot Hollow Point

GI                           Government Issue

GOA                       Gun Owners of America

GPU                       Gas Piston Upper

GR                          Grain


H&H                       Holland & Holland

H&R                        Harrington & Richardson

HBWC                    Hollow-Base Wad Cutter

HC                           Hard Cast

HD                          Home Defense/Heavy Duty

HEAT                     High Explosive Anti Tank

HP                          Hollow Point/Home Protection

HPBT                     Hollow Point Boat Tail

HPJ                        Remington High Performance Jacketed (Golden Saber)

HS                          Hydra-Shok

HSC                        Handgun Safety Certificate

HST                        Hammer, Sear, & Trigger


IBA                         Individual Body Armor = Bullet Proof Vest

IBS                          International Bench rest Shooters

IDPA                      International Defensive Pistol Association International Defensive Pistol Association

IHMSA                  International Handgun Metallic Silhouette Association

ILA                          Institute for Legislative Action - NRA

IMBEL                   Indústria de Material Bélico do Brasil (Military Material Industry) a Brazilian state company, founded in 1975.

IMR                        Improved Military Rifle

IPSC                       International Practical Shooting Confederation International Practical Shooting Confederation

IWB                        Inside the Waistband, holster

IDPA                      International Defensive Pistol Association

IWB                        Inside the Waistband, referring to holsters


JBB                         Jack Bauer Bag

JDJ                          J. D. Jones

JHC                         Jacketed Hollow Cavity

JHP                         Jacketed Hollow Point

JMB                       John Moses Browning

JPFO                      Jews for the Preservation of Firearms Ownership

JSP                         Jacketed Soft Point


K98                         German Mauser 98 in karbine length

KAC                        Knight's Armament Company

KYPD                     Keep Your Powder Dry


LAC                        Law Abiding Citizen

LC                           Long Colt

L-C/T                      Hornady Lead Combat/Target

LCP                         Lightweight Compact Pistol

LCR                         Lightweight Compact Revolver

LE                            Law Enforcement

LEA                         Law Enforcement Agency

LEAA                      Law Enforcement Alliance of America

LEO                        Law Enforcement Officer

LF                            Lethal Force

LFI                          Lethal Force Institute

LGS                        Local Gun Shop

LHP                        Lead Hollow Point

LOS                        Line Of Sight

LR                           Long Rifle/Lower Receiver

LRN                        Lead, Round Nose

LRPK                      Lower Receiver Parts Kit

LSR                         Light Sniper Rifle

LSWC                     Lead Semi-Wad Cutter

LSWCHP-GC         Lead Semi-Wad Cutter Hollow Point -Gas Check (Keith, hollow cavity)

LTC                         Lead Truncated Cone

LTL                          Less Than Lethal

LV-JHP                    Low Velocity-Jacketed Hollow Point

LWC                       Lead Wad Cutter


M193                     5.56x45mm 55-grain ball cartridge.

M195                     5.56x45mm grenade launching blank.

M196                     5.56x45mm 54-grain tracer cartridge, red cartridge tip.

M202                     5.56x45mm 58-grain FN SSX822 cartridge

M755                     5.56x45mm grenade launching blank specifically for the M234 launcher.

M855                     5.56x45mm 62-grain FN SS109 ball cartridge, green tip w/steel penetrator and a lead core.

M855 LF                62-grain green tip w/tungsten penetrator and a steel core. Lead Free

M856                     5.56x45mm 64-grain FN L110 tracer cartridge

M995                     5.56x45mm 52-grain AP cartridge, black cartridge tip.

MAG                      Box Magazine/Magnum

MC                         Metal Cased

ME                         Muzzle energy/Middle East

Mils                        Milliradians

MIM                      Metal Injection Molding/Powder metal processing

Mk262                  5.56x45mm 77-grain Open-Tipped Match/Hollow-Point Boat-Tail cartridge.

MK318                  5.56x45mm 62-grain Open-Tipped Match/Hollow-Point Boat-Tail cartridge.

MLU-26                Early USAF designation for 5.56x45mm ball cartridge produced by Remington.

MM                       Millimeter

MN                        Mosin Nagant

MOA                     Minute Of Angle

MOB                      Middle Of Back

MOD                     Moderator

MOE                      Magpul Original Equipment

MRWC                  Mid-Range Wad Cutter

MSH                      Main Spring Housing

MV                         Muzzle Velocity


NAA                       North American Arms

NATO                    North Atlantic Treaty Organization

NBRSA                  National Bench rest Shooters Association

NCIC                      National Crime Information Center

ND                          Negligent Discharge

NDF                       Non-Drop Free - original Glock magazines were designed to stay in the gun if the magazine release was pressed                                 and there were rounds remaining in the magazine

NEF                        New England Firearms

NFA                       National Firearms Act (of 1934 )

NFML                    Non-Fully Metal Lined magazines also known as Non-Drop Free (NDF)

NGT                       New Gun Test

NRA                       National Rifle Association

NSSF                      National Shooting Sports Foundation

NRMA                   National Reloading Manufacturers Association

NSSF                      National Shooting Sports Foundation


O/U                       Over/Under

OAL                       Office of Administrative Law

OODA                   OODA Loop, Observe, Orient, Decide, and Act. It takes 0.25 of a second to cycle through this decision process.

OOS                       Out Of State

OC                          Open Carry

OM                        Oscar Mike/On the Move

O/S                        Over/Sized

OTB                       Out of The Box

OTM                      Open Tip Match

OWB                      Outside the Waistband, holster

OWB                      Outside the Waistband, referring to holsters


PB                           Lead/Lead Bullet

PBR                        Point Blank Range

PDS                        Piston Driven System RRA

PDSC                     Piston Driven System Carbine RRA

PDSP                     Piston Driven System Pistol RRA

PDSR                     Pistol Driven System Rifle RRA

PDW                      Personal Defense Weapon

PERP                      Perpetrator, criminal

PIRC                       Pre-Incident Response Conditioning

PIRT                       Pre-Incident Response Training

PK                           A 7.62 mm general purpose machine gun designed in the Soviet Union and currently in production in Russia

PKM                      It ("Kalashnikov's Machine-gun Modernized") current, modernized, product-improved version of the PK model

PL                           Remington Power-Lokt

POA                       Point Of Aim

POI                         Point Of Impact

POST                     Peace Officer Standards and Training

POV                       Privately Owned Vehicle

PPC                        Pindell-Palmisano Cartridge

PRI                         Precision Reflex Inc.

PRS                        Precision Rifle/Sniper

PSI                          Pounds Per Square Inch

PSP                        Pointed Soft Point/Plated Soft Point

P&R                       Pinned barrel and Recessed cylinder


Q                             Torque

QA                          Quality Assurance

QC                          Quality Control

QFT                        Quoted For Truth

QTY                        Quantity


RBC                        Rifle Bore Cleaner

RDK                        Rapid Deployment Kit

RDS                        Red Dot Sight

RE                           Receiver Extension (Buffer Tube)

REM                       Remington

RF                           RimFire

RFB                        Rifle, Forward-ejecting Bullpup

RIA                         Rock Island Arsenal

RKBA                     Right to Keep and Bear Arms

RN                          Round Nose

RNL                        Round Nosed Lead

RR                           Range Report

RRA                        Rock River Arms

RUM                      Remington Ultra Mag

RSO                       Range Safety Officer


S&H                       Sharpe & Hart

S&W                      Smith & Wesson

SA                           Semi Auto/Springfield Armory/Springer/Single Action

SAA                        Single Action Army

SAAMI                  Sporting Arms and Ammunition Manufacturers Institute

SAF                        Second Amendment Foundation

SAM                      Shooters Arms Manufacturing (in the Philippines)

SAR                        Search And Rescue

SAS                        Second Amendment Sisters

SASS                      Single Action Shooting Society

SBR                        Short Barreled Rifle

SBS                         Short Barreled Shotgun

SCAR                     Special Operations Forces (SOF) Combat Assault Rifle

SCBS                      Shooter's Choice Bore Solvent

SCSA                      Steel Challenge Shooting Association SCSA

SD                           Self Defense/Sectional Density

SDG                       Self-Defense Gun

SE                           Special Edition

SJSP                       Semi-Jacketed Soft Point

SLR                         Self Loading Rifle

SMG                      SubMachine Gun

SMLE                     Short Magazine Lee Enfield- the .303 caliber British Army rifle

SN                          Serial Number

SNAFU                  Situation Normal, All Foobared Up

SOP                        Standard Operating Procedure

SP                           Soft Point/Spire Point

SPC                        6.8 Special Purpose Cartridge

SPL                         Sound Pressure Level

Spl.                         Special - As In .38 Spl.

SPR                        Special Police Rifle/Special Purpose Rifle

SPRG                     Springfield Armory

SRT                         Special Response Team/Swift Response Team

SS                           Stainless Steel

SS109                    NATO code for the M855 (US CODE) 5.56x45 62 grain FMJ

SSA                        Single Action Army (Colt's SA Revolver/Colt 45)

SSAA                     Sporting Shooters Association of Australia

SSS                         Shooting Southern Style (canebrake style)

STA                        Shooting Times Alaskan

STE                         Shooting Times Easterner

STHP                      Winchester Silvertip Hollow Point

STW                       Shooting Times Westerner

SUR                        Sport Utility Rifle

SWAT                    Special Weapons And Tactics

SWC                       Semi-Wad Cutter

SWS                       Superior Weapons Systems

SX                           (Hornady) Super eXplosive

SXT                         (Winchester) Supreme eXpansion Talon (Black Talon)


TC                           Truncated Cone/Thompson Center

TCU                        Thompson/Center

TDI                         Tactical Defense Institute

TFL                         The Firing Line

TMJ                        Total Metal Jacketed

TOT                        Time On Trigger

TPF                         Ten Percent Firearms

TRP                        Tactical Response Pistol


UBR                       Utility/Battle Rifle

UPLULA                Universal Pistol Loader - UnLoader

USPSA                  United States Practical Shooting Association

USRAC                  U.S. Repeating Arms Company


VCDL                     Virginia Citizens Defense League

VLD                        Very Low Drag


WAGC                   Women Against Gun Control

WC                         Wad Cutter

WCF                       Winchester Center Fire

WIN                       Winchester

WMR                     Winchester Magnum Rimfire

WP                         White Phosphorus/Willy Pete/Whiskey Papa

WWB                     Winchester White Box/Wally World Bullets


XM287                  5.56x45mm 68-grain ball cartridge produced by Industries Valcartier, Inc. An Improved version was also produced designated XM779.

XM288                  5.56x45mm 68-grain tracer cartridge produced by Industries Valcartier, Inc. An Improved version was also produced designated XM780

XM777                  5.56x45mm ball cartridge.

XM778                  5.56x45mm tracer cartridge.

XM996                  5.56x45mm so-called "Dim Tracer" with reduced effect primarily for use with night vision devices.

XTP                        (Hornady) eXtreme Terminal Performance


YHM                      Yankee Hill Machine

YOM                      Year Of Manufacture


Z                              Zed/Zero/0/



n (ak-shuh)

The mechanism of a gun, usually breechloading, by which it is loaded, fired, and unloaded. The operating mechanism of a gun - firearm involved with presenting the cartridge for firing, and in removing the spent casing and introducing a fresh cartridge.

 Firearm Action

Firearm Action

Action Shooting

(ăk′shən)    (sho͞ot)

A generic term for a variety of shooting games usually characterized by extreme speed of fire, relatively powerful handguns, medium to large targets and short to medium ranges. Often called "Combat Shooting." IPSC-style competitions, bowling pin and falling plate matches are all typical of this type of shooting. Practical shooting is a sport which challenges an individual's ability to shoot rapidly and accurately with a full-power handgun, rifle, or shotgun. To do this, shooters take on obstacle-laden shooting courses called stages, some requiring many shots to complete, and others just a few. While scoring systems vary between practical shooting organizations, each measures the speed with which the stage is completed, with penalties for inaccurate shooting.

Cowboy Action Shooting Cowboy Action Shooting                                                                IPSC Shooting Competition IPSC Shooting Competition

Adjustable Stock

ad·just′a·ble -  stŏk

The stock is the wooden, polymer, or metal handle of a long gun that extends from the trigger back to where the gun is braced against the shoulder. An adjustable stock is one that can be easily lengthened or shortened to fit shooters of different sizes.

Adjustable Polymer Rifle Stock Adjustable Polymer Rifle Stock                                                    Adjustable Wood Rifle Stock Adjustable Wood Rifle Stock

Adjustable Trigger

ad·just′a·ble - trĭg′ər

A trigger that can be easily adjusted by the user. Adjustable triggers are common on specialized target-shooting firearms, but rare on self defense firearms.

 Metal Adjustable Trigger Metal Adjustable Trigger Polymer Adjustable Trigger Polymer Adjustable Trigger

Air Gun

[′er ‚gən]

Not a firearm but a gun that uses compressed air or CO2 to propel a projectile. Examples: BB gun, pellet gun, CO2 gun. An air gun or airgun (also called pellet gun or rarely a gas gun) is any one of a variety of guns that propel projectiles by means of compressed air or other gas, in contrast to firearms which use a propellant charge. Both the rifle and pistol forms (air rifle and air pistol) normally fire metallic projectiles, either pellets or spherical balls based on the BB size of birdshot - although a few fire darts.

Air Gun Rifles
Air Gun Rifles
Air Gun Pistol
Air Gun Pistol










Ambidextrous Safety

[¦am·bə¦dek·strəs]    (sāf′tē)

A manual, external safety which can be easily reached with either hand. Usually one lever on each side of the firearm. A safety catch that can be operated by either hand. Of benefit to left-handed shooters and in the event of an injury to the right hand.

Ambidextrous Safety Ambidextrous Safety


(ăm′ō) or am•mo (ˈæm oʊ)

Ammunition, projectiles to be fired from a gun.  Ammunition consisting of a cylindrical casing containing an explosive charge and a bullet; fired from a rifle or handgun.

Liberty Civil Defense Ammo
Liberty Civil Defense Ammo



















am·mu·ni·tion (ăm′yə-nĭsh′ən)

Ammunition is gunpowder and artillery, or broadly anything that can be used in combat including bombs, missiles, warheads, landmines, naval mines, and anti-personnel mines. The word comes from the French la munition which is all material used for war. The collective term for all types of ammunition is munitions.

The purpose of ammunition is to project force against a selected target. However, the nature of ammunition use also includes delivery or combat supporting munitions such aspyrotechnic or incendiary compounds. Since the design of the cartridge, the meaning has been transferred to the assembly of a projectile and its propellant in a single package.

The "packaged" components that are needed in order to fire in a case or shell holding a primer, (which produces the spark) a charge of propellant (gunpowder) and a projectile (bullets, slug or pellets.) Sometimes called "fixed ammunition" to differentiate from the individual components placed separately in muzzleloaders. A single unit of ammunition in modern firearms is called a cartridge. The units of measure for quantity of ammunition is rounds. There are hundreds of sizes of ammunition.

Diagram of a CartridgeDiagram of Ammunition RoundHandgun and Rifle Ammunition  Handgun and Rifle Ammunition

Antique Firearms

an·tique (ăn-tēk′) An antique (Latin: antiquus; "old", "ancient")

An antique firearm is a term to describe a firearm that was designed and manufactured prior to the beginning of the 20th century. Although the exact definition of what constitutes an "antique firearm" varies between countries, the advent of smokeless powder or the start of the Boer War are often used as cut-off dates.  Antique firearms are usually collected because of their historical interest and/or their monetary value. By U.S. federal definition, a firearm manufactured prior to 1899 or a firearm for which ammunition is not generally available or a firearm incapable of firing fixed ammunition.

Antique Pistols
Antique Pistols


















Aperture Sight

[′ap·ə‚chər ‚sīt]

An irregularly shaped adjustable mechanical item usually integral to a rear sight; it functions as a peephole through which the sight at the opposite end of a gun is brought into view in aiming at a target or object. An iron sight system of aligned markers used to assist in the aiming of a device such as a firearm, crossbow, or telescope that excludes the use of optics as in a scope. Also known as Peep Sights.

Aperture Sight
Aperture Sight


















AR 15 Rifle

The AR-15 comes in many sizes and has many options, depending on the manufacturer. The Colt AR-15 is a lightweight, 5.56 mm, magazine-fed, semi-automatic rifle, with a rotating-lock bolt, actuated by direct impingement gas operation or long/short stroke piston operation. It is manufactured with the extensive use of aluminum alloys and synthetic materials. The AR-15 was first built by ArmaLite as an assault rifle for the United States armed forces.

The AR-15 is a widely owned semi-automatic rifle. The AR does not stand for "Assualt Rifle" as many believe, it was named after the manufacturer that first built it, Armalite.














AR 15
  • The AR-15 is a lightweight, intermediate cartridge magazine-fed, air-cooled rifle with a rotating lock bolt, actuated by direct impingement gas-operation or long/short stroke piston operation. It has been produced in many different configurations, including semi-automatic.

  • AR does NOT stand for Assault Rifle, as is commonly believed. AR stands for the original company that manufactured it, ArmaLite. ArmaLite sold their rights to the AR-10 and AR-15 designs in 1959 to Colt.
Armor Piercing Ammunition

ar·mor (är′mər)

A type of ammunition designed to penetrate armor or armor-plated targets such as tanks, trucks, and other vehicles. An armor-piercing shell must withstand the shock of punching through armor plating. Shells designed for this purpose have a greatly strengthened case with a specially hardened and shaped nose, and a much smaller bursting charge. An armor-piercing (AP) shell is a type of ammunition designed to penetrate armor. From the 1860s to 1950s, a major application of armor-piercing projectiles was to defeat the thick armor carried on many warships. From the 1920s onwards, armor-piercing weapons were required for anti-tank missions. Furthermore it is used to defeat concrete, ballistic vests, bulletproof glass, and other defenses.

Armor Piercing Ammunition
Armor Piercing Ammunition



















ar·se·nal (är′sə-nəl)

A government establishment where firearms and ammunition are stored, repaired, or manufactured. The term is misused by the media to mean more than one firearm or any quantity of ammunition, as in "they found an arsenal."A governmental establishment for the storing, development, manufacturing, testing, or repairing of arms, ammunition, and other war materiel.


Over the centuries an Arsenal has included every variant of such a place, whether privately or publicly owned (with the latter in older royal and modern state-owned versions).

An Example of a Home Arsenal
An Example of what the News media would Call a Home Based Arsenal



















ar·til·ler·y (är-tĭl′ə-rē)

Large bore diameter (nominally 3" or greater) firearms designed to be operated by a crew of individuals. They are utilized to project explosive, armor defeating, incendiary, or nuclear projectiles over great distances. They are normally moved by vehicle because of their size and weight. "Cannon," mortars, howitzers, and similar are considered artillery.

Artillery is a weapon of war that operates by projection of munitions far beyond the effective range of personal weapons. Artillery comprise specialised devices which use some form of stored energy to operate, whether mechanical, chemical, or electromagnetic. Originally designed to breach fortifications, they have evolved from nearly static installations intended to reduce a single obstacle to highly mobile weapons of great flexibility in which now reposes the greater portion of a modern army's offensive capabilities.



















Assault Rifle

as·sault (ə-sôlt′)  ri`fle

An assault rifle is a selective fire (selective between automatic, semi-automatic, and burst fire) rifle that uses an intermediate cartridge and a detachable magazine. Assault rifles are the standard service rifles in most modern armies. Note; the difference between the assault rifle and the battle rifle. Assault rifles use smaller cartridges and are used at closer ranges than battlerifles. The larger sized rifle cartridges used in battle rifles make fully automatic fire more difficult.

Assault Rifles & Carbines
Assault Rifles & Carbines























































Assault Weapon

as·sault (ə-sôlt′)   weap·on (wĕp′ən)

Assault weapon is a political and legal term that refers to different types of firearms and weapons, and is a term that has differing meanings, usages and purposes.

In discussions about gun laws and gun politics in the United States, an assault weapon is most commonly defined as a semi-automatic firearm possessing certain cosmetic, ergonomic, orconstruction features similar to those of military firearms.

A political term with no fixed definition, being defined differently by different jurisdictions. Because the actual definition is so fluid, laws written to regulate assault weapons often define the term by various cosmetic characteristics which do not affect a firearm's power or function in any fundamental way. Despite public perception, assault weapons are not machine guns. They are semi-automatic firearms, not fully automatic firearms.

The term is distinct from the term assault rifle, which is a technical term with a specific meaning widely accepted both in law and within the military and firearms communities.

Assault Weapon Assault Weapon



  • A firearm with an automatic loading mechanism. A firearm that automatically loads the next cartridge to be fired into the chamber either upon the pull of the trigger in an open bolt design or upon the firing of the previous round in a close bolt design. Over time this term has been shortened to just "auto" and sometimes "automatic" thus creating confusion between a full-auto firearm and a semi-automatic firearm. An autoloader or auto-loader is a mechanical aid or replacement for the personnel that load ordnance into crew-served weapons, such as tanks and artillery. The term is generally only applied to larger weapons that would otherwisehave a dedicated person or persons loading them. Semi-automatic firearms are sometimes informally called "auto-loaders". However, this is a derivation of the term "auto-loading" rather than a physical "autoloader", as discussed here.

  • An autoloader, as its name suggests, extracts a shell and propellant charge from the ammunition storage rack/compartment and loads it into a magazine, if the gun has one, or directly into the chamber of the gun if it does not. It can and often does replace a human loader. 























Automatic Firearm

ȯd·ə¦mad·ik  ′fīr‚ärm

An automatic firearm is any firearm that will continue to fire so long as the trigger is pressed and held and there is ammunition in the magazine/chamber. While both "semi automatic" and"fully automatic" weapons are "automatic" in technical sense that the firearm automatically cycles between rounds with each trigger pull, under conventional usage a merely semi-automaticfirearm is not correctly referred to an "automatic weapon" or an "automatic firearm". The terms "automatic weapon" and "automatic firearm" are conventionally reserved to describe fullyautomatic firearms. Confusion can be avoided by this convention. A semi-automatic firearm fires one round with each individual trigger pull, while a fully automatic continuously fires roundswhilst the trigger is pressed and held.


The speed of fully automatic firearms is measured in rounds per minute (RPM) or rounds per second (RPS), in what is called the Rate of fire. The speed of fully automatic firearms iscompared to each other this way.


Glock 18 Machine PistolGlock 18 Machine Pistol                                                    HK mg4 light machine gunHK mg4 light machine gun