airsoft cyma mp5 Prowin m4 adapter kit

This kit is for advanced modification. It allows you to use a airsoft m4 prowin hop up in your cyma mp5. This is my design tested over and over and it works great. To be clear, it is NOT drop in, but close to. You will need to sand the prowin hop up at two spots, once around the blocky bottom front so it does not hit the magwell and you will need to shorten the feed tube a bit so that mag when pressed against the hop up sits flush against the blocky part. Even then the mag will sit lower, and y…

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