I am thinking about getting one of these for my vfc hk416, would i need the rear wired m4 version, or the rear wired m16a2 version? Also, do these fit in the vfc body without any trouble? I dont want to have to bust out the dremel. And one last thing, I heard these are picky about motor cages, so would this box play nice with the stock vfc motor and cage, or do i need a different set up there?
Thanks!
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