The file 'Pistol Chamber Safety Flag 3D Printer Model' is (stl) file type, size is 221.5KB.
I duplicated a standard design (dark orange in image) as I needed for a range day and didn't have time to wait on delivery.
Fits 9mm or larger. Easy fast print/
Pistol_Chamber_Safety_Flag_v3.stl | 824.4KB |