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Unless some clone manufacturer starting making the hop-up wheels in white plastic, then that hop-up unit is a Systema and is one of the best you can buy (so that shouldn't be the problem). Systema doesn't make any other hop-ups so that's the one for your M4/M16.
If the mag goes in fine with the upper receiver/hop-up removed then you know there's a problem with one of those parts interfering with the mag.
I would start by taking the upper receiver off, put the hop-up on the gearbox, and shove the mag in. Pay attention to what part of the hop-up isn't lining up correctly, or what piece of metal the mag is catching on. Pictures would also be good so we can help diagnose the problem.
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