Try an 80% finished lower, from KT Ordnance. Then Big Brother doesn't know about your fighting rifle. NO serial number or license or signature or ID or background check is required to buy either the 80% receiver or the other parts. In theory, you can never sell the finished 80% lower, but you can certainly sell the other parts. 1911's cn be finished in this manner, also. Check out the info on such things at HomeGunsmithing.com and AR-15.com
I recently built and fired my first AR (first AR ever, not just first build). It's very easy. I think I have about an hour's worth of labor in it. I used a Stag lower, LAR Grizzly (a "second" due to cosmetic defects), DPMS UPK, RRA LPK and bolt assembly, Bushmaster Superlight 16" barrel, and Hogue Overmolded FF Tube. I shot it for the first time Wednesday. 110 rounds without a problem.
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