This tool makes locating the gas block directly over the gas port an extremely easy job, especially on this new barrel. Die hard builders say it's not necessary. I found it to be extremely easy and recommend it to anyone who anticipates taking a drill to a barel.
There is a video on the manufacturer's site that shows how a top name barrel was discovered to be incorrectly dimpled and how the owner fixed it with the jig.
https://www.rainierarms.com/?page=sh...roduct_id=1089



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