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I have a CA M15A4 and am looking at getting a C-Mag for it. I was wondering how they work exactly, like do they feed on their own or do you have to wind them like hi caps or what? And then I was also wondering if I should get the CA 2500rd one for $135 or the Hero Arms 3000rd one for $140? Do either of these have feed problems or anything? Thanks for the help.