Rosco ROSCO 556NATO/300BLK BCG Phosphate Black

Description

This Rosco bolt carrier group is built for AR-15 platforms and engineered for durability and consistent performance. It uses a phosphate finish and incorporates a chrome-lined gas key and bolt channel for increased wear resistance. Bolts are shot peened, MP-tested, and matched to their extensions, while the gas key is properly staked for reliable function. The BCG is described by the manufacturer as full-auto rated and includes upgraded extractors.

Key Specifications

• The finish is Phosphate.
• The color is Black.
• This unit is a Bolt Carrier Group designed for AR-15 platforms.
• It features a chrome-lined gas key and bolt channel for added durability.
• The gas key is properly staked to maintain secure alignment.
• Bolts are shot peened and MP-tested to improve longevity and consistency.
• Bolts are matched to their extensions for consistent lockup.
• Includes upgraded extractors for dependable extraction.
• Manufactured to meet MIL specifications as stated by the maker.

Durable in finish and designed around service-proven features, this BCG aims to deliver consistent lockup and dependable operation for high-use environments like range work, competition, and routine maintenance. Its combination of treated components and MIL-spec construction provides a solid foundation for an AR-15 build or parts refresh.