This is a picatinny rail for the side rails on the Worker Pump Grip Kit (F10555) for the Nerf Longshot.
I would suggest that you print with 100% infill to ensure your attachments stay put while running etc.The photographed print was printed at 0.2mm
You will need three M3 screws that will screw into the existing threaded holes on the worker rail. You must ensure the screws do not protrude from the rear of the rail to prevent scratching the blaster shell.
The Nerf elite blue Filament used:
https://www.innofil3d.com/product/pla-blue-1-75mm-750gr/
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/3JETOcRJmy1
