You must have the scar engraved before you have the barrel cut...otherwise you'll be breaking the federal law of receiving with intent to build an NFA weapon (or something like that.) After you have it engraved and registered you can use either barrel.
May I ask what the purpose of SBR'ing the SCAR is?
"Arms are the only true badge of liberty. The possession of arms is the distinction of a free man from a slave." - Andrew Fletcher, 1698
"You cannot invade the mainland United States. There would be a rifle behind each blade of grass." - Admiral Isoroku Yamamoto
"Among Other Evils Which Being Unarmed Brings You, It Causes You To Be Despised." - The Prince, Nicolo Machiavelli
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