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