As long as they're for the correct WE system (AWSS / closed bolt or the newer open bolt), then the mags should work fine from one to the other.
I have an open bolt PDW, and I use the open bolt M4 mags. I have the 1 PDW mag that came with the gun, but it's crap. The gas reservoir is very small and it runs out of gas far too quickly. Even if they did work on the AR models, I wouldn't use them.
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