ONE HORSE LLC MIL-SPEC 5.56/300BLK BOLT CARRIER GROUP FOR AR-15/M16 NICKEL BORON Dominate any range with this precision-crafted M16 Bolt Carrier Group (BCG). Designed for seamless compatibility with 5.56 NATO and .300 Blackout, this BCG ensures flawless cycling and extraction in any build. Every component is treated with a premium nickel boron finish for exceptional corrosion resistance, ultra-low friction, and effortless cleaning, delivering smoother operation than standard coatings. Built to exacting Mil-Spec standards, it's the ultimate choice for reliability and performance. Precision-machined 9310 steel bolt and 8620 steel carrier, fully nickel bor Mfg: One Horse