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Message: <blockquote data-quote="trbii" data-source="post: 3897569" data-attributes="member: 2449"><p>Thanks for the reply. Don’t have instructions, probably left them with the gunsmith, years ago. My digital caliper reads barrel diameter as .745 . Video I watched said the conversion kit  gas block was for a .750 barrel. I’m wondering if the big cut across the barrel and the huge drill start gouges under the block location are metal moving “staking”, done by a young gunsmith trying to make the two piece gas block clamp more securely. Remember hearing he commented to an older, experienced colleague, that at his gunsmith school, they covered AR smithing in one day. I didn’t realize the implications of that back then.</p></blockquote><p></p>