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My comments are specifically relevant to create an ATF NFA regulated firearm. If you have a non-serialized, 80% lower (not a firearm) and finish it into working order AND create a non-NFA regulated finished device, then the serial number is not required, BUT it is for your own personal use. Not for sale.

Doing the finish work usually requires special tools, a fair bit of skill and time. I don't own those kind of tools, yet my tool investment for assembling an AR is still significant. Special torque wrenches, roll pin punches, jigs for holding parts in position for assembly, caliber specific go/no-go chamber gauges, lubricants, staking punches for BCG gas keys, a burring tool for securing a gas block on a barrel, specialized jig to hold the barrel while torquing the barrel nut on the upper receiver. It's a lot more work and expense than the average gang banger wants to do. It's easier for them to just steal one or buy a stolen weapon from another criminal.