i have never seen this setup used by the US marine corp?did they take 20mm twin mounts off the ships and put them on 40mm bofors mounts?
https://www.marines.mil/Portals/1/P...N 19000313300_2.pdf?ver=2012-10-11-163218-643
you have to scroll down to page 25
https://www.marines.mil/Portals/1/P...N 19000313300_2.pdf?ver=2012-10-11-163218-643
you have to scroll down to page 25