- Inertial Firing Pin
A firing pin that is too short to contact the cartridge's primer when the hammer is resting on it and can only hit the primer when driven forward under the momentum of the hammer blow. The system used in the Colt 1911 is an example of an inertial firing pin.
International Practical Shooting Confederation. The governing body for much of the action/combat shooting competition conducted worldwide. Often used as a term for this type of competition. IPSC's American affiliate is the United States Practical Shooting Association (Dept. GAH, Box 811, Sedro Woolley, WA 98284)