I have guy wanting to trade a lower for some work. How can I tell if this a was a lower removed from a rifle or a build? I want to put a 10' upper and do not want to violate SBR. "Once a rifle, always a rifle"
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Is it anyway I can confirm it was ???FIRST a rifle always a rifle
Can the manufacturer tell you how it was registered when first shipped to the wholesaler / distributor? Some MFG use different markings and S/N ranges for "rifles" vs. pistols, vs. stripped lowers.
