I have two AR rifles. One has a standard mil-spec Parkerized BCG, the other is a PSA nickel boron. I much prefer the NiB to the mil-spec. It's a better BCG in just about every single way.And by quality I’m referring to MPI/HPT C158 bolts, phosphate CL carriers the likes of Colt, DD, BCM, SOLGW, Toolcraft, etc. None of that fancy, “enhanced, NiB, nano pvd, coating of the week nonsense.
End rant.