Nerf Retaliator - Pump action with Picatinny rail

My goal was to design a very streamlined Pump action for the Nerf Retaliator.
Compatible with Picatinny Foregrips.

The connection between the Pumpgrip and the Slide is made out of Ø 2mm TIG welding filler rod. For dimensions check the Photo.
If the press fit of the Ø 2mm rod in the printed part is not enough than you can secure the it with short M3 screws.

You have to mod the Slide according to the pictures.
Everything has to fit precisely or it won't work.

So far i only tested this