KNS non-rotating trigger and hammer pins are the strongest pins that can be produced and are designed to withstand the high impact of full and semi-auto 9mm, .223, and 7.62mm suppressed weapons. An absolute must-have for all NFA owners. They will also protect your AR-15. Special anti-creep retainers prevent wear on your irreplaceable registered NFA receiver. No modification to firearm required. Specifications for KNS Precision AR-15/M16 Gen 2 MOD 2 Non-Rotate Trigger/Hammer Pins: Manufacturer: KNS Precision Trigger Pin Size: 0.154 in Fabric/Material: Steel Condition: New Features of KNS Precision AR-15/M16 Gen 2 MOD 2 Non-Rotate Trigger/Hammer Pins The torque spec on the screw is 11 inch/lbs, maximum, recommend 8 inch/lbs of torque. The external width of some AR receivers may vary in the trigger/hammer pin area depending on the manufacturer. The pins being slightly too long will not affect the function or performance. Package Contents: KNS Precision AR-15/M16 Gen 2 MOD 2 Non-Rotate Trigger/Hammer Pins Pin Installation Tool 2 Torx Wrenches