I thought I'd seen a post discussing this here somewhere before but I guess my search skills suck because I can't find it.
Can someone tell me if there is a way to register my AR lowers so I can swap uppers with different barrel lengths. . Right now both my AR's are registered with barrel lengths listed on the registration paper. One is a 14.5" (368mm) and the other is a 16" (406mm). I built another upper with a 16" barrel and would like to be able to transport it with either lower.
How is it registered if you buy only a lower on it's own.
Can someone tell me if there is a way to register my AR lowers so I can swap uppers with different barrel lengths. . Right now both my AR's are registered with barrel lengths listed on the registration paper. One is a 14.5" (368mm) and the other is a 16" (406mm). I built another upper with a 16" barrel and would like to be able to transport it with either lower.
How is it registered if you buy only a lower on it's own.



















































