ROSCO 556NATO/300BLK BCG MELONITE BK

The Rosco Melonite Bolt Carrier Groups are designed to meet the needs of modern carbine shooters. They incorporate input from both consumers and military end users to ensure you get the product you require, not just what they want to sell. All Rosco BCGs conform to MIL specifications and feature a properly staked gas key along with a Melonite coating for enhanced durability. They also include a shot-peened/MP-tested matched bolt (with an upgraded extractor) engineered to lock up precisely with their extensions for exceptional accuracy. These BCGs are built to withstand full-auto rated fire and demanding use from the end user.

• Carrier Material: 8620 Steel
• Gas Key: 4130 Steel, attached with Grade 8 hardware, properly staked
• Cam Pin: Hardened 4340
• Firing Pin: 8740 Steel, Mil-Spec, Center-less ground & Hard Chrome coated Bolt Material: 9310, Properly Heat treated, MPI/HPT
• Extractor: 4340 Steel
• Ejector: S7 Tool Steel