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The reason I bought an ACR is that the lower on the ACR is replaceable (Non S/N part), the trigger & safety pack slides out like a Hk 91/93. You can replace the bbl assembly & bolt head and just slide you trigger/safety assembly in a 7.62x39 lower and you are good to go; MagPul designed the gun to be fully modular. I have heard that w/ Remington now pushing hard for LE/Military sales that these parts should come on line quickly.