AR15.Com Archives
 nickel boron coating piston parts?
fslflint  [Member]
11/18/2011 3:40:24 PM
has anybody had the gas plug, bolt carrier and piston Nickel Boron coated?

I know the clearances are very close on these parts. I'm not sure of the exact surface buildup of the NiB coating, I imagine it to be minimal.