The Bushmaster AR-15 Complete Bolt Carrier Group is precision-machined from high-quality, ordnance grade steel to mil-spec tolerances and features a matte black phosphate finish. Learn more here
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Personally I always loved Bushmaster bolts. I bought a brand named full auto carrier from a well respected company and had short stroking issues with it. I tested the carrier key for leaks and noticed bubbles coming out. When I checked another rifle with the Bushmaster bolt in it, it produced 0 bubbles and is air tight carrier key. It works and fits like a charm. I bought a brand new Bushmaster from brownells and notice Bushmaster has done more to their bolts over the years. For one it is staked a little better than the one I had from 2011. The MAJOR difference is the newer bolt having a o-ring already on the extractor and get this, unlike most full auto bolts I own, the o-ring doesn't make it near impossible to take the extractor retainer pin out. You can easily disassemble. The new Bushmaster bolt I got was air tight as well around the carrier key. I just put in a new order, hours ago, for a spare Bushmaster bolt for any future builds in case I notice any other problems with bolts I have on any other builds.