Built for dependable performance across demanding range sessions, the ROSCO 556NATO/300BLK BCG Melonite BK brings durable construction and versatile compatibility to a MIL-SPEC AR-15 platform. Its black Melonite finish supports corrosion and wear resistance while helping reduce carbon buildup for smoother operation and simpler cleanup, with a refined, low-glare black appearance.
Designed for both 5.56 NATO and .300 Blackout, this complete bolt carrier group suits multi-caliber builds and a range of shooting configurations, including suppressed or unsuppressed use, and supersonic or subsonic ammunition. The full-auto profile carrier is machined from 8620 steel, while the 9310 steel bolt is MPI-tested and shot-peened for strength. Heat-treated components and MIL-SPEC assembly provide a dependable foundation for your compatible upper receiver. The BCG arrives assembled with a properly staked gas key, firing pin, cam pin, and retaining pin, ready for installation in a MIL-SPEC AR-15 upper. Its durable surface treatment and material choices make routine inspection and cleaning straightforward, keeping maintenance manageable over extended use.
- Complete bolt carrier group for 5.56 NATO and .300 Blackout
- Black Melonite nitride finish for corrosion and wear resistance
- 8620 steel carrier with a full-auto profile
- 9310 steel bolt, MPI-tested and shot-peened for added strength
- Heat-treated, MIL-SPEC construction for dependable performance
- Properly staked gas key with firing pin, cam pin, and retaining pin
- Fully assembled and ready for compatible MIL-SPEC AR-15 upper receivers
Choose the ROSCO Melonite BCG for a hard-wearing, low-maintenance AR-15 component that adds cross-caliber flexibility and trusted Rosco Manufacturing quality to your compatible build, with dependable performance.
