01-03-2014, 06:41 PM
LRRPF52 Wrote:Another thing I do with uppers that tend to be loose is Cerakote the inside, then lap the carrier raceways so the carrier doesn't gall with the Cerakote during cycling. The Nickel Boron BCG's work really well in this regard. Some guns with over-sized "match" bolt carriers can and have been known to run sluggishly in the past, so you do have to be mindful of what it takes to make an AR15 run well when you start talking about changing the ID with coatings.
Very curious about this. When you cerakote an ar. What parts do you cerakote, or more importantly, which ones do you not. I know that a NiBo carrier and the bolt are no go's. I'm assuming you don't do the extension? complete inside of the upper? If so, how are you lapping the raceway? What about the lower and LPK?