The file 'Picatinny (MIL-STD-1913) Rail Generator 3D Printer Model' is (scad,stl) file type, size is 3.7KB.
This is a very simple rail generator, based on the dimensions provided on the Wikipedia page for Picatinny Rails.
I have not yet tested this for fitment, but will do so at first opportunity.
mil-std-1913-rail-generator.scad | 1.9KB | |
mil-std-1913-rail-generator.stl | 48.4KB |