WASR-10 rifle with out a bump stock fitted Bump stocks or bump fire stocks are gun stocks that can be applied to help in bump firing, the act of utilizing the recoil of a semi-automatic firearm to fireside cartridges in quick succession. Designed in 1942, the U.S. M1 Thompson was https://machguns.com/product/m10-9mm-rpb-mac-b2952/