Description

ROSCO 556NATO/300BLK BCG PHOS BLK – BUILT FOR HARD USE, READY FOR DUTY

The ROSCO 556NATO/300BLK BCG PHOS BLK is a duty-ready bolt carrier group designed for reliability, durability, and consistent performance. Whether you're running 5.56 NATO or .300 Blackout, this BCG is engineered to meet the demands of shooters who expect rugged dependability from their rifle.

MIL-SPEC CONSTRUCTION FOR FIELD-PROVEN PERFORMANCE

Manufactured to strict MIL-SPEC standards, this BCG features a full-auto rated 8620 steel carrier paired with a 9310 steel bolt. Each bolt is MPI (Magnetic Particle Inspected) and shot-peened for added strength and stress resistance, ensuring reliable cycling in high-pressure conditions.

PHOSPHATE FINISH WITH CHROME-LINED INTERIOR

The exterior phosphate finish offers time-tested corrosion resistance, while the chrome-lined interior improves smoothness and longevity. This combination gives the ROSCO 556NATO/300BLK BCG PHOS BLK the edge in adverse environments and extended shooting sessions.

COMPATIBLE WITH 5.56 NATO & .300 BLACKOUT

Optimized for both 5.56 NATO and .300 BLK, this BCG gives you flexible performance across multiple calibers. It's a dependable choice whether you're shooting suppressed or unsuppressed, supersonic or subsonic.

DROP-IN READY FOR AR-15 BUILDS

The ROSCO PHOS BLK BCG comes fully assembled with a properly staked gas key, firing pin, cam pin, and retaining pin. It’s ready to install in any MIL-SPEC AR-15 upper, making it ideal for new builds, replacements, or upgrades.

FEATURES:

Complete BCG for 5.56 NATO / .300 BLK
Phosphate finish with chrome-lined interior
8620 steel carrier, full-auto profile
9310 MPI-tested bolt, shot-peened
Properly staked gas key
Fully assembled and drop-in ready

WHY CHOOSE THE ROSCO 556NATO/300BLK BCG PHOS BLK?

Rosco Manufacturing is known for producing high-quality components trusted by professionals and serious shooters. The ROSCO 556NATO/300BLK BCG PHOS BLK continues that tradition—offering field-proven materials, superior construction, and versatile performance in any AR-15 platform.

ORDER YOUR ROSCO 556NATO/300BLK BCG PHOS BLK TODAY

Equip your rifle with a carrier group you can rely on. The ROSCO 556NATO/300BLK BCG PHOS BLK is ready for whatever your mission demands—on the range, in the field, or in defense.