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.
My mr223a3 lower fits on normal AR15 uppers. I did not shoot it, but from a design perspective it fits and dry-fires hus suggesting it should be ok for other AR15 uppers in diff. Calibers?
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