BCM's bcg's a good, w/o a doubt but really nothing special.............plenty just as good for similar prices.
For a comparable top-shelf bcg, Griffin Armament just had theirs on sale for around $130ish & Rubber City Armory regularly has blems available for a good price & a really high quality part.
And I'll take nitriding over phosphate (BCM) any day, especially for cleaning of the bolt stem.
MM
I do like RCA BCG's. That nitriding they use is damn near indestructible. Its smooth and very easy to keep clean. The rest of my BCG's are nickel boron, but I won't replace the RCA's I have.