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What are the advantages of a Nickel Boron BCG? Are they worth the money? Do I need one in my AR15? Below are the top 3 reasons your AR15 might need one. Reason #1 - Reliability Of all AR15 parts, the bolt carrier group is without a doubt the most critical component for proper functioning. It is not only the most complicated component but also the hardest working one as well. The bolt is the forward-most part of an AR BCG. It must properly contain the high chamber pressures …