I have had my XPB BCG for years now and probably have well over 3000+ rounds through it. It has seen suppressed fire and some limited amount of full auto fire. I keep my guns cleaned and oiled so I have never torture tested it but can say I have never had a failure to fire feed or eject. Not much more to ask of a BCG. Probably one of the best features of it is the DLC coating. Doesn’t feel slick like NIB but it is easier to clean than NIB and doesn’t stain or tarnish. The coating barely has any wear on the rails or on the bottom where the hammer rubs. The coating is just phenomenal.

Fantastic BCG, excellent machine work, DLC is like glass. A perfect addition to your custom build or an excellent upgrade to your mill spec rifle. Highly recommend.

Doesn’t give 300 black out bolt carrier options???

Great bolt. The quality is awesome, the finish is very nice. Ran it a few days ago and it ran flawlessly. Looking to buy another.

Got one of these for my .458 SOCOM build and I could not be more happy with it. The quality is absolutely impeccable and the design features are truly superior. S7 is ridiculously tough stuff originally designed for mining rock drill bits so that should tell you just how impact resistant it is even at very high through hardness even after millions of impact load cycles. About to buy a second one for my 20” 556 and soon yet another for the .300blk