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These Rosco Bolt Carrier Groups (BCGs) are available in 5.56/300 BLK variants and come with a Phosphate coating that features a Chrome Lined Gas Key and Bolt Channel. These BCGs are Full-Auto rated, properly staked, and the bolts are Matched to the barrel. Additionally, there is a Nitride version that features a melonite coating for extended performance.

Rosco has carefully balanced input from consumer and military end users to meet modern-day carbine shooter requirements and bring you the product you need. Rest assured that all Rosco BCGs are to MIL specification and feature a properly staked gas key and a chrome lined coating for extended performance.

These BCGs also have a Shot Peened/MP tested Matched bolt (with upgraded extractor) that locks up perfectly with their extensions for extreme accuracy. Made to withstand Full-Auto rated fire and unforgiving use from the end user, they are a reliable choice for your firearm.

The carrier material is made of 8620 Steel, the Gas Key is made of 4130 Steel, and the Cam Pin is made from Hardened 4340 Steel. The Firing Pin is made from 8740 Steel, Heat Treated, Mil-Spec, Center-less ground, Hard Chrome Plated. The Bolt Material is C158, Phosphate Coated, MPI/HPT. The Phosphate Extractor is made from 4140 Steel, Heat Treated, Shot Peened while the Nitride Extractor is made from 4340 Steel. The Phosphate Ejector is made from S2-S7 Tool Steel, Shot Peened, and the Nitride Ejector is made from S7 Tool Steel.

Lastly, Rosco Phosphate/Chrome ONLY BCGs come with an upgraded Sprinco Extractor Kit.