WASR-10 rifle and not using a bump inventory fitted Bump stocks or bump fireplace stocks are gun stocks which might be utilised to aid in bump firing, the act of utilizing the recoil of a semi-automatic firearm to fire cartridges in rapid succession. Created in 1942, the U.S. M1 Thompson https://machguns.com/product/m10-45-acp-mac-rpb-excellent-c318/