The file 'BIPOD RIFLE GUN – FOR 20-22MM RAIL 3D Printer Model' is (STL) file type, size is 65.1KB.
https://youtu.be/CYUf6fe7Ey4
complete model here https://cults3d.com/en/3d-model/gadget/bipod-rifle-gun-for-20-22mm-rail-balonek