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Posted: 12/14/2013 4:01:49 AM EST
I know this goes a bit further than the typical AR build, but I need to learn nonetheless.
I assume the gas port is typically drilled after the extension is torqued?

So, anyone have knowledge, a video, book, website etc they want to share?
Link Posted: 12/14/2013 4:16:30 AM EST
Link Posted: 12/14/2013 4:24:25 AM EST
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