re: Official AR-15 thread

I wound up going with the one from sonics weapon systems that is np3 coated. From what I gather it won't discolor like the NiB and should be slicker. I'm sure either is not much different than a regular bcg but I wanted to try something different. I liked the sonics because of the price for np3 coated and it has the bcm spring that I think has one more coiled that people seem to like.