If you're going to run nickel then buy a Sionics NP3 BCG. Most of my BCGs are BCM with a few Colt but I have a couple Sionics and they are good to go. I tried some nickel boron but the finish wears off easily even with the best mfg. I fired thousands of rounds to come to this conclusion. There is guys here far more experienced than I which I'm sure will agree with my findings.


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