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Regionalphilbin 10 points ago +11 / -1

Can someone please explain what this means? I am a gun idiot. I mean, I know enough about hunting rifles, and hunted irregularly since I was 12. I grew up on a farm, but I don't know anything about 80% lowers.

10
username_is_taken 10 points ago +10 / -0

An AR has a lower receiver.

An 80% lower is a chunk of metal that has been milled out to 80% complete.

The extra 20% has to be performed to complete to create a 100% lower receiver.

On the AR platform only the lower receiver is governed by law requiring an FFL to handle a buy/sell.

80% doesn't require paperwork since it's just an oddly shaped block of metal.