One Horse M16 Bolt Carrier Group Features The One Horse M16 Bolt Carrier Group pairs a precision-machined 9310 steel bolt with an 8620 steel carrier a combination chosen for its strength and resistance to wear under repeated firing cycles. The full nickel boron finish coats every component delivering exceptional corrosion resistance along with ultra-low friction that keeps the action cycling smoothly shot after shot. This coating also makes field cleaning noticeably easier than it is with a standard phosphate-finished carrier group since fouling does not bond to the surface as readily. Compatibility with both 5.56/.223 and .300 Blackout barrels gives builders flexibility across multiple chamberings without needing a different BCG for each. Mil-Spec construction standards govern every stage of assembly including a properly staked gas key that resists loosening under recoil and a shot-peened bolt that resists stress fractures over extended service life. These details matter most under high round counts where a lesser BCG can fail at the gas key or crack at the bolt lugs. Finished in a silver nickel boron coating for easy visual inspection of wear this bolt carrier group is built to drop into any Mil-Spec compatible AR-15 or M16 upper. For a shooter upgrading reliability and corrosion resistance on a build this One Horse BCG is available for sale at GrabAGun. One Horse M16 Bolt Carrier Group Specifications Manufacturer: One Horse Model: M16 Bolt Carrier Group Compatible Hosts: M16 AR-15 5.56/.300 AAC Blackout builds Material: 9310 Steel Bolt / 8620 Steel Carrier Finish: Nickel Boron Color: Silver Gas Key: Staked Bolt: Shot-Peened Caliber: 5.56 Available At: GrabAGun