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ProWin M4 Chamber for Marui M4 (AEG) Review


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I have one installed in one of my G&P uppers. It fits perfectly well. I didn't have a over-the-barrel spring, so I used a portion of hop rubber (3mm width) that I had cut to fit in another gun. The rubber compresses enough to keep the chamber against the gearbox.

The fake bolt plate clears just enough to make the hop adjustments, and once these are done you won't need to re-adjust anyway.

 

I have another Pro-win chamber installed in a DBOYS AKMS and it works perfectly too. In that one I have 2FPS variance between shots :)

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