I’ve built tons of AR-15 uppers and a good majority of them use Low Profile Gas Blocks with set screws and a few are pinned to the barrel. A couple of things I’ve learned with experience is that I always use Loctite on the set screws and whenever possible, I prefer to have the barrel dimpled for the set screw to seat in properly and really lock the gas block in place. It always amazes me when I spend good money on a barrel only to find that they didn’t take the time to dimple the barrel on the bottom …read more
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