You either have to put a flash hider on that will bring the length to 16" minimum and then have it permanently attached or you have to (already should have) submit a form 1. It's only taking about 30 days +-5 door to door on a form 1 right now. Unless the current flash hider makes the barrel 16" and is permanently attached don't install it on your lower without an approved form1. Someone could easily make a case for having an illegal SBR just for possessing the upper and having a lower that is not registered.
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