Other categories you might be interested in are 9mm Luger Ammunition, Books, Boots & Footwear, Bore Snakes, Bow Cases. Buy from for great service and great gear at great prices. Call on our AR product experts via email, chat, or phone for help deciding what to buy. For background information, browse our informative collection of articles about AR15 parts, including a section about assembly of the bolt carrier group. For the most reliability, check for models that have been shot-peened, high pressure tested (HPI), and/or Magnetic Particle Inspected (MPI) for quality assurance. All these finishes assure corrosion resistance and reliable functioning. Our BCG collection is available with Phosphate, NP3, Melonite, and Nitride coatings as well as eye-catching Nickel Boron. You can also browse models that have been rated as best by our informed customers. I have never had an issue running either one I'm running a mid-length gas system with a carbine weight buffer. Full auto BCG has a marginal additional mass and might be slightly better for carbine gas. Popular brands like JP Enterprises, Faxon Firearms and CMMG offer high quality BCGs that will go the distance on your modern sporting rifle. Semi circle Bcg's were for Colt lowers with a sear block. The Bolt Carrier Group is the heart of your AR15 or AR10, so shop from our wide selection of options in finishes, colors, and calibers.
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