37 mm gun M1

37 mm gun M1A2 on carriage M3
37 mm antiaircraft gun in the Solomon Islands.
Type	Anti-aircraft autocannon
Place of origin	United States
Service history
Used by	USA
Wars	World War II Rhodesian Bush War
Production history
Designer	John M. Browning and the Colt company
Produced	1939–July 1943
No. built	At least 7,278
Specifications
Mass	2,780 kg (6,130 lb)
Barrel length	bore: 2 m (6.56 ft) / 54 calibers
Width	1.7 m (5 ft 7 in)
Height	1.8 m (5 ft 11 in)[1]
Shell	Fixed QF 37×223mmSR
Shell weight	.6 kg (1 lb 5 oz)
Caliber	37 mm (1.45 in)
Breech	vertical block
Carriage	four-wheeled trailer
Elevation	-5° to + 90°
Traverse	360°[1]
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)[1]

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

The gun was produced in a towed variant, or mounted along 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.^[2]

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.^[3]