KNS Precision’s PERMA Pin is a firing pin retaining pin manufactured from tool steel that functions as a drop-in replacement for the standard cotter pin in most AR-15/M16 bolt carrier groups. This solid pin design was originally intended by Eugene Stoner and eliminates the cotter pin found in MIL-SPEC bolt carrier groups. Built with precision-machined, high-strength construction, the PERMA Pin streamlines bolt carrier group reassembly and installs more readily than traditional cotter pins.
The PERMA Pin is engineered to fit milspec bolt carriers and is not compatible with .308 bolt carriers. Your rifle requires no modification, and installation demands no special tools. Whether performing routine maintenance or assembling multiple rifles, the PERMA Pin delivers a measurable improvement every time you clean your rifle.
