I am considering putting a Vltor A5 Receiver Extension, Spring and Buffer Kit on a MK12 to mimic the recoil impulse of a rifle length system, since that is what the rifle was designed for. Would a SOPMOD stock fit on the Vltor A5? The receiver extension is supposed to be longer than a standard carbine extension. I assume that means it will not collapse down as far the Vltor A5. Correct? How much longer is it?
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