Why would you want to go through the hassle?
Who would care if you used the lower for 5.56mm, 6.5mm, and 6.8mm uppers?
I don't think it's worth the time or the potential for being disapproved just because it's different than ever other permit request they see.
Same thing goes for different barrel lengths. As long as it's my SBR lower I don't worry about it.


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