37mm Gun M1

37mm Gun M1A2 on Carriage M3
37mm antiaircraft gun in the Solomon Islands.
Type	Anti-aircraft autocannon
Place of origin	USA
Service history
Used by	USA
Wars	World War II
Production history
Designer	John M. Browning and the Colt company
Produced	1939–?
No. built	7,278
Specifications
Barrel length	bore: 2 m (6.56 ft) / 54 calibers
Shell	37×223mmSR
Caliber	37 mm (1.45 in)
Breech	vertical block
Carriage	four-wheeled trailer
Elevation	-5° to + 90°
Traverse	360°
Rate of fire	120 rounds per minute
Muzzle velocity	792 m/s (2,598 ft/s)
Effective firing range	3,200 m (3,499 yds)
Maximum firing range	8,275 m (9,049 yds)

The 37mm Gun M1 was an anti-aircraft developed in the United States. It was used by the US Army in World War II.

In addition to the towed variant, the gun was mounted, with two M2 machine guns, on the M2/M3 half-track, resulting in the T28/T28E1/M15/M15A1 series of multiple gun motor carriages.

In early World War II, each Army Anti-Aircraft Artillery (AAA) Auto-Weapons battalion was authorized a total of thirty-two 37 mm guns in its four firing batteries, plus other weapons.

During World War II the 37 mm gun M1 was deployed in coast defense Anti-Motor Torpedo Boat Batteries (AMTB) alongside 90 mm guns, usually four 90 mm and two 37 mm guns per battery. Some AMTB batteries consisted of four 37 mm guns, but most sources have little information on these batteries. In the later part of the war the 37 mm gun was typically replaced by the 40 mm Bofors gun M1.

Two gun units were coupled to the M5 gun director using the M1 remote control system. The system was powered by the M5 generating unit. If the remote system was inoperative the M5 sighting system was used.

The M1 utilized fixed ammunition. Projectiles were fitted with a 37×223mmSR cartridge case.