I had my ump conversion done by Allegheny arms in Bethel Pennsylvania. The gunsmith there Josh did a great job. I had him do everything but shorten the barrel. I have not filed the paperwork yet for an SBR but my question is, do I buy an aftermarket Barrel or go ahead and cut the USC Barrel? I realize that both are viable options but I have to ask what would you do. Keep the original Barrel because it's through the number to the receiver or just whack it?