One Horse M16 5.56/.300 Blackout AR-15 BCG - Nitride

A rugged, full-spec M16 bolt carrier group for 5.56 and .300 Blackout builds — at a price that makes quality accessible. The One Horse M16 BCG combines 9310 tool steel bolt, 8620 AQ steel carrier, MPI inspection, and a full salt bath nitride treatment into a properly staked, full-auto-compatible bolt carrier group built entirely from USA materials.

The One Horse M16 BCG is a full-profile M16 bolt carrier group compatible with 5.56 NATO, .223 Rem, and .300 Blackout AR-15 platforms, machined from 9310 tool steel bolt and 8620 AQ steel carrier with a full salt bath nitride finish, MPI-inspected, and properly staked gas key.

Four specifications define this BCG's quality for the price point. The 9310 tool steel bolt is fully heat treated, MPI-inspected, and shot peened with lugs chamfered for reliability — the same inspection and material standards applied by premium BCG manufacturers, ensuring material integrity before the bolt goes into a rifle. S7 tool steel extractor with spring, insert, and O-ring installed provides consistent, positive extraction across the full range of 5.56 and .300 BLK load pressures. Full salt bath nitride on the bolt, carrier, and cam pin delivers superior corrosion resistance and a low-friction bore surface that extends cleaning intervals and improves cycling smoothness compared to phosphate alternatives. The gas key is staked with Grade 8 fasteners and features forward assist serrations, maintaining full compatibility with both forward-assist and non-forward-assist upper receivers.

Compatible with AR-15 platform rifles chambered in 5.56 NATO, .223 Rem, and .300 Blackout. M16 full-auto profile carrier. Forward assist compatible.

9310 tool steel bolt, 8620 AQ steel carrier. Full salt bath nitride finish. MPI-inspected. Grade 8 staked gas key. Made in the USA.

Ideal for 5.56 and .300 BLK AR-15 builds, replacement BCG applications, and high-volume training setups requiring a quality, easy-to-clean bolt carrier group at an accessible price.

By One Horse. All USA materials and manufacturing. Standard manufacturer warranty applies.