Whether you’re looking to finish off a new AR-15 build or you need a spare bolt-carrier group to have on-hand as a ready replacement (always a good idea), Brownells has you covered with its AR-15 Bolt Carrier Group. This ready-to-roll BCG is built to provide dependable operation in any AR-15 chambered in 5.56 NATO, .223 Remington or 300 Blackout.
Each Brownells AR-15 Bolt-Carrier Group features a bolt machined from 9310 tool steel, which is heat-treated and shot-peened. The carrier itself is machined from 8620 hardened steel. Both of these components, as well as every other part in the bolt-carrier group, are finished in a nitride coating. Every bolt is magnetic-particle inspected and features a torqued-and-staked gas key.
With each Brownells AR-15 Bolt-Carrier Group, you’ll receive the bolt, bolt carrier, gas key, firing pin, cam pin, firing pin retaining pin and an extractor with the necessary spring and rubber insert. This bolt-carrier group will work with any cartridge based on the 5.56 NATO case, and it is not designed for use in full-auto lower receivers.
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by Mobuck
I was looking for BCG(s) to complete a couple of uppers and Brownells had them at a competitive price. I’ve found I could trust Brownells to provide excellent service and reliable quality products. It was even better when the parts arrived promptly. One BCG is already installed and checks out perfectly. The only improvement I could ask for is to have Brownells name/logo rollstamped on the part.
by Scotsdown
Slick black finish, runs smoothly in the receiver. Should last a long time.
by Appalachian
So far I’ve purchased and used 5 of these bcgs. I’ve had no issues running them in a wide array of different 223/556 ar uppers. They seem of good quality and function well. I’ve been pleased and will purchase again.