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About the slides not locking back, haven't encountered that yet (only put 2 mags through it so far though, no time to test it much yet) but I did note upon initial inspection that WE doesn't seem to believe in lube; the whole gun ships bone dry.
I went ahead and lubed up the valves on the good mag (silicone shock oil) and applied a thin coat of white lithium grease on contact areas between the slide and frame (something I do to all my GBBs, it makes a noticeable difference). That might help a bit.
Otherwise I'd guess it's related to pressure/mag cool down.
I'll be looking at it in more detail over the weekend.
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