Master Models' 1/350 Italian 37mm/54 BREDA barrel sets contains 20 individual barrels for the 37mm guns, suitable for any of the three mount types which were in service with the Regia Marina. This close-range anti-aircraft gun saw service on various vessels before and during World War Two.

The instructions below illustrate a twin 1932 mount with the barrel brace; the Littorio class fielded the twin 1938 mount (no barrel brace) and single 1939 mounts. All of these mounts had external compensators for the recoiling breeches.