The file 'Soviet 37mm Model 1939 Anti-Aircraft Gun 3D Printer Model' is (stl) file type, size is 269.5KB.
A rather crude version of the 37mm AA but at 15mm or reduced even further to 1/200 it may pass muster
Mined from 3D warehouse cleaned up and scaled for 15mm figs
37mm_AA.stl | 675.2KB |