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As far as my experience goes, They have first gen, second gen, and third gen Metal bodies up to this point.
first gen was the one that was complete utter crap, the magwell was so small that sanding/dremeling had to be done to fit in most magazines.
The second gen had good compatibility, all my TMs, JG, Dboys, KWA, MAG, all fit just fine.
Third Gen has a pretty big magwell, larger than normal. I had a couple S.Arms Midcaps back in the days, they were the fattest mags I've ever used. The S.arms mags didnt fit my KWA, TM, nor JG, but it fit the 3rd Gen Dboys Metal body easily.
Hope that helps
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