US Patent 10156421 Adjustable length bi-directional folding stock for firearm

A stock for a firearm. In some embodiments, the stock is configured for bi-directional folding to either side of a receiver of the firearm. In some embodiments, the stock is configured for length adjustment. A biasing element is provided for the length adjustment that biases a proximal (butt) subassembly of the stock against the shoulder of the user. The user can adjust the length of the stock by moving his or her shoulder fore and aft against the butt of the stock. The bi-directional folding and the shoulder length adjustment aspects may be incorporated into a single embodiment.