Minor design changes to a weapon is no big deal. People have rechambered the AR15 to blowback operation and 9mm and .45acp, AK's built in .50 Beowulf. Minor design changes wont get you in trouble as long as the design changes are not major NFA violations or AW violations.
Build off the flow chart and you will be fine and have a leg to stand on if need be.
Originally Posted by ar15barrels
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