An absolute must-have for all M-16 owners. These are the Generation ST pin sets that were designed for the Spike’s Tactical Compressor Rifle Series. These are the STRONGEST pins that can be produced and were designed to withstand the high impact of full and semi-auto 9mm, .223, and 7.62mm suppressed weapons. The pins are stainless steel. The Custom designed end retainers are Phosphated and then Dura Coated with a Flat Dark Earth to match the Magpul color. An absolute must-have for all M-16 owners. They will also protect your AR-15. Special anti-creep retainers prevent wear on your irreplaceable M-16 or AR-15 receiver. Pin installation tool & 2 Torx wrenches included. No modification to firearm required. This pin set is only available in .154 diameter.