Does anyone have experiences with different caliber uppers on an MR223A3?
In NL, I am limited in the number of firearms I can own (5), but I can have any number of uppers for a single, registered lower. Specifically, I will be considering a .22, 7.62x39 and perhaps a 9mm upper.
I think it's the MR762 and/or 308 that is not compatible with alternate lowers.
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