Depends what kind you're going for. Each gun calls for its own different magazine. For another example that doesn't require anything broken, check out my BAW (posted by someone else).
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Ive seen that its great but it uses to many ball joints :'(
I have a pretty realistic one but it does, like all removable mags (at least least top loading ones) require broken pieces. It is used in this gun by TheChemiker, and I have used it in a couple of guns. Ironman's also are very effective, however I like the magazine release in mine.
look on ironmans profile... thats how