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TSD M4's use the same mechbox and hop up systems as a marui. That said every brand has little differences to make them unique. In this case it could be your mag well, if its a different size it might need to be filed or have tape in it to allow other mags to fit.
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Originally Posted by Crunchmeister
Imagine ads for semen restaurants. I can see it now... "Come to Seminal Sam's, where you can eat loads without blowing all your wad..."
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