AR-15 Lower Receiver Compatibility With MGC M4A1 Hypothesis

From my very limited knowledge about how the MGC M4A1, the fire control group on the MGC seems to work exactly the same as the fire control group on a real AR-15 platform rifle. Would a real fgc be compatible with a modelgun, let alone a whole real steel AR-15 lower? My second hypothesis is that a real AR-15 lower would accept real magazines and chamber the rounds correctly, unlike with the MGC that has a smaller magwell. Would the PFC rounds go in the magazine properly? Would the bcg chamber the rounds correctly? Are there any size differences that need to be accounted for? Any differences in functionality compared to a real AR-15 lower? Please let me know.

There are size differences, to my knowledge, across the entire MGC range of parts. So for example, everything may be 95% to 98% correct… but they are designed to not accept any original parts or be interchangeable. So an original lower receiver would not marry to an MGC upper and vice versa. That’s a massive generalisation but basically, the assumption is that parts are not readily interchangeable. That being said, rounds would likely fit inside MGC mags or original mags without any problem.