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Don't do it. C-Mags on an M4 are douche-y. M4's weren't meant to be support weapons, and if you play in any milsims they won't let you put a c-mag on your M4 and call it a LMG.
That being said, you probably would want to get a reinforced mechbox, better piston, and gears, among other things. But I would say just run it till it breaks, and then upgrade it.
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