It features our taper mount shoulder to align with our barrels and silencers, uses a 1/2 inch socket on the front for easy install and removal, and features 360 circumferential ports to alleviate the need for timing and shims. Backwards compatible with standard 90 degree shouldered barrels. SPECS WEIGHT: 2.0 oz. OVERALL LENGTH: 1.64 inches MATERIAL: 17-4 Stainless Steel LENGTH ADDED TO BARREL: 0.8 inches THREADS: 1/2-28(9mm BORE) DO NOT shoot 9mm through a 7.62 silencer! RECOMMENDED TOOLS We have seen a wide range of outside diameters for 1/2 inch sockets. 1/4 inch drive sockets are generally the best for Cherry Bombs, though we have 1/2 inch drive sockets that work as well. Here is a confirmed compatible socket. Paramount 1/2 , 3/8 Drive See the last image for installation instructions NOTE: Rocksett not include. Rocksett can be purchased at the link below. Rocksett FREQUENTLY ASKED QUESTIONS (FAQ) Can I use the Cherry Bomb on my 90 shouldered barrel? Yes. Here s what we recommend for a minimum shoulder. DOWNLOAD Can this be pinned and welded to my 14.5 barrel to make it 16 ? The Cherry Bomb is too short and NOT recommended for pinning and welding to a barrel.