I don't know the cost difference, but I know the MG4 is a lot nicer to shoot. Anyone who's spent time behind a MK46 or M249 can attest to the "gas in the eyes" (similar to shooting an MP5SD but worse). I never felt that with the MG4. Then again, I only got to put just under 100 rounds through, but if you could throw a 10.5" barrel on it? Man that'd be a sweet little gun.
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