The Soviet recoil-operated 37mm anti aircraft guns are based on a Bofors design and closely resemble the 40mm guns used in both the British and United States forces during World Mar II. Although the single mount is the most common version, a twin mount was produced and has been exported to Algeria. The Soviet Navy also employed a twin water-cooled version closely resembling the multi-mount United States 40mm guns used in World War II. The 37nm guns have hydraulic recoil buffers and spring recuperators. The breechblocks are of the rising block type. The field mobile weapon may be equipped with a shield. There is no provision for radar fire control. The 37mm  M1939 is used in Communist China where it is known as the Type 55.

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These photos and the story are from D Troop Platoon Leader LTC [ret] Robert Suchke.

A 2/17 Cav little bird spotted the muzzle flash suppressor of this weapon sticking out of a bunker opening out in the Ashau Valley. My platoon got the mission to go check it out. We went in and secured the area and then I blew the top off the bunker. We called for  a CH-47 to pull it out but they would not fly out into the valley, so blew the barrel and receiver off the carriage and we loaded it on a UH-1H. Col Molinelli was so proud of his trophy that it was mounted in front of the 2/17Cav Headquarters on a cement pad.  We hauled off a bunch of 37mm round also. It was mounted on a 4 wheel towed carriage.