If I bought an AR15 stripped lower and decided to build an AR15 pistol with it, do I need to mark the lower in any way to designate that it's a pistol? A shooting buddy said I had to engrave it as a pistol because it's not legal to switch a lower back and forth from a pistol to a rifle. I mentioned that my Thompson-Center Encore isn't engraved as a pistol and I'm allowed to convert it back and forth. I tried looking on the ATF website and I can't find an answer. Thanks
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