The file 'Picatinny Rail Mount For PPS 40mm Airsoft Grenade/Shower Shell 3D Printer Model' is (scad,stl) file type, size is 13.2KB.
This is a picatinny rail mount made specifically to attach a PPS 40mm shower shell to a KWA ATP airsoft pistol but it should be appropriate for attaching most any 40mm accessory to a picatinny rail. I've included the .scad files for modifications, in particular you may want to resize the top portion to accommodate whatever you intend to use it on.
ShowerShellG18v7.scad | 1.5KB | |
ShowerShellG18v7.stl | 192.0KB |