Description
These 5.56 / 300 BLK Bolt Carrier Groups are Phosphate Coated with Chrome Lined Gas Key & Bolt Channel, Full-Auto rated, properly staked, and the bolts are Matched to the barrel. Our Rosco Phosphate Bolt Carrier Groups are designed to meet the modern-day carbine shooters requirements.
For our Phosphate Bolt Carrier Groups we choose to team up with the best Microbest, so the end-user has dependability time after time, every time.
We have also balanced input from our consumers and military end users in order to bring you the product you need, not just the one we want to sell you.
These BCGs are to MIL Specification and have a properly staked gas key along with a chrome-lined coating for extended performance. They also feature a Shot Peened/ MP tested Matched bolt (with an upgraded extractor) which is designed to lock up perfectly with our extensions for extreme accuracy. These BCGs are made to withstand Full-Auto rated fire and unforgiving use from the end user.
Carrier Material: 8620 Steel
Gas Key: 4130 Steel, attached with Grade 8 hardware, properly staked
Cam Pin: Hardened 4340 Steel
Firing Pin: 8740 Steel, Heat Treated, Mil-Spec, Center-less ground, Hard Chrome Plated
Bolt Material: C158, Phosphate Coated, MPI/HPT
Extractor: 4140 Steel, Heat Treated, Shot Peened
Ejector: S2-S7 Tool Steel, Shot Peened
Our Phosphate/Chrome BCGs ship with an upgraded Sprinco Extractor Kit
Additional information
Weight 0.7875 lbs
Dimensions 8 × 1.25 × 1.25 in
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