Bunker's Shoulder Thingy (Open Beta)

This is the official open beta for my 1913 rail buffer tube system! It should be compatible with any picatinny rail with at least 4 slots. It has the same geometry as an AR buffer tube, so any mil-spec stock or brace should fit onto it. If you have interest in testing this design, please contact me at BackyardBunker@protonmail.com. There, you can send any questions, comments, suggestions, or even testing photos/videos! Note: at this stage in testing, this is intended for 9x19mm and smaller. Do not test this on firearms whose muzzle energy is greater than 9x19mm (this also forbids 9x19mm +P). LBRY Tags: 3d printing; gun; guns