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Old March 18, 1999, 12:00 PM   #3
B. Strong
Junior Member
 
Join Date: March 18, 1999
Location: Peoples Republik of Kali.
Posts: 14
As fal308 says, it is always best to get the answer straight from ATF, but as the lower receiver is the registered part, I see no reason why you can't replace the upper assembly on a pre-81 OB MAC. If the piece is a carbine type, don't put a pistol upper on it W/O ATF reg. as an SBR though.
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