%20no-repeat%20center%20center;-webkit-background-size:cover;-moz-background-size:cover;-o-background-size:cover;background-size:%20cover; "Ar15 Barrel Installation")
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I got the same Umbrella grease.
Have your tried shimming your barrel to the upper receiver? It makes for tighter groups imo. I’ve heard of bedding the barrel to the upper with green loctite but I haven’t tried it yet.
Is a Daniel defense barrell nut