I share with you the mini roni kit that I made for my glock cyma electrica for airsoft, you can make the barrel of the gun in 3D but I recommend putting a metal barrel, the gun was painted satin black.
It may be necessary to heat in some places so that it fits well since it is very tight, so do not paint in the area where the weapon rests, first place the back part with the selector on semi-automatic, then fit the front part.
I hope it helps you!
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The author remixed this model.
It has the space to be able to put the airsoft marker and the necessary fitting.