the present folding stock adapter can be used with many types of military - type assault rifles that typically comprise a receiver extension , buffer and action spring . the present folding stock adapter can be used to add a folding capability to a standard stock allowing it to fold against a rifle &# 39 ; s receiver when the weapon is not in use , thus reducing the overall length of the weapon . this reduction in length can facilitate its maneuverability , storage and transport in cramped quarters . the present device can also allow for the quick unfolding of the stock in order to allow the weapon to function and be fire normally .