Colt Colt 223/5.56mm AR Bolt Repair Kit (M4) SPK403979

The Colt SPK403979 is a genuine, mil-spec Original Equipment Manufacturer (OEM) field repair kit designed to keep your AR-15 or M4 bolt carrier group functioning at peak reliability. This kit targets the highest-wear components inside the bolt assembly that are prone to fatigue from extended strings of fire. By replacing worn gas rings, extractor springs, and pins, shooters can instantly eliminate extraction failures and short-cycling issues. It is manufactured by Colt’s Manufacturing to exacting military tolerances, making this ultra-compact kit an essential addition to any range bag, armorer's bench, or emergency field kit.