If you are piecing together an AR15 upper you have most likely wondered what bolt carrier group or BCG you should go with. These days many manufactures are spitting out BCG’s each with its own set of pros and cons. Listing all of your required features will help narrow down the search to a handful of different BCGs. When I pieced out and built my 11.5” AR15, my requirements were that the BCG had to be affordable, full-auto rated, and TiN-coated was preferred. Enter the Brownells M16 Bolt Carrier Group with the Titanium Nitride coating.
TiN
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