Custom, stainless steel bolt carrier features a 100% increase in bearing surface for smooth cycling and outstanding reliability. Includes the dust cover notch for tactical duty or any application requiring absolute "no-fail" operation. Expanded, exterior, bearing surfaces are hand polished and ensure precise alignment in upper receiver for less wear. Non-plated carrier bore is roller burnished for low-drag movement. Rear of carrier is designed in the AR-15, semi-auto configuration with longer, mil-spec cocking pad in the front. Five-step QPQ process produces an exceptionally hard, wear-resistant high-lubricity black finish. Comes with steel gas key installed. JP LMOS& Mfg: J P Enterprises SPECS: 416 stainless steel, polished, black QPQ finish. Includes steel key. 9 oz. (255g). Weight: 6.75 oz. with key installed.