Re: mounting an ar-15 barrel
I built my first AR with just a couple brass punches and a armorers combo wrench. The barrel already had the extension and Front sight post on it. Took about 45-60 min. You can borrow or buy the Headspace gauges. Of all the AR's I have built none have ever been out of headspace. Check out Shotgun News for a ton of companies selling kits for under 450. I recently built a sweet retro AR with a A1 upper and 16" pencil barrel for under $500. Very light weight and runs like a dream.
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