COLT .223 REM/.5.56MM NATO BOLT REPAIR KIT FOR AR-15/M4 The Colt AR-15/M4 Lower Field Repair Kit is a compact, duty-ready assortment of genuine Colt mil-spec components engineered to keep your rifle running when small parts wear out or fail. Built for shooters who rely on proven OEM quality, this kit refreshes the most commonly used lower-receiver internals, restoring smooth function, positive controls, and dependable lockup. Whether it lives in a range bag, armorer kit, or field pack, it provides a reliable, factory-correct solution for maintaining AR15/M4 performance under hard use. SPECS Platform: AR-15 / M4 Color: Black Compatibility: Mfg: Colt