I'm the guy that put the v2 mechbox in the walmart M4 field duty kit by DPMS(PANTHER ARMS). It does fit, but it's tight...It was actually the mechbox from my well cqb bought from huang. The only problem I had so far is that on auto the screws that hold the motor plate on pulled out. I did get around 10 shots through my chrono before I tried auto, and it shot from 342-357 fps. LOL If you want pics, I'll take it apart and show you... and I still have the plastic gearbox that came with the M4...
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