These are the Generation 2 pin sets. They are the STRONGEST pins that can be produced and were designed to withstand the high impact of full and semi-automatic 9mm and .223 suppressed weapons. They will also fit the .308 AR rifles.
The pins are stainless steel. End retainers are black Nitride. 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 & screws included. No modification to firearm required.
THE TORQUE SPEC ON THE SCREW IS 11 inch/lbs. MAXIMUM.
Very good quality pins, will definitely be using these again.