Are these a good idea? There's a barrel from ballistic advantage i'm interested in and the barrels with the profile I want have Nickle boron coated barrel extensions and feed ramps. These are coated by Failzero if that means anything. My question is doesn't NiB have a tendency to chip? And since the locking lugs are such a critical area, wouldn't a chipped NiB coating throw the locking lugs out of spec? Also doesn't this coating eventually wear off? To coat things that have specific tolerances, there has to be slightly less material to account for the coating thickness. The benefits of an NiB barrel extension is the added lubricity of feed and bolt operation which would help to prevent malfunctions and I think, potentially, better fitment to the receiver.
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