4.5-inch gun M1

4.5 inch gun M1 on carriage M1
4.5 inch gun M1 at the U.S. Army Field Artillery Museum, Ft. Sill, Oklahoma
Type	Field gun
Place of origin	United States
Service history
In service	1942–1945
Used by	United States
Wars	World War II
Production history
Designed	1939–1941
Produced	September 1942–February 1944
No. built	426
Specifications
Mass	5,654 kg (12,465 lbs)
Length	8.15 m (27 ft)
Barrel length	Bore: 4.756 m (15 ft 7 in) L/41.6 Overall: 4.918 m (16 ft 2 in) L/43
Width	2.4 m (7 ft 10 in)
Height	2.12 m (6 ft 11 in)
Shell	separate-loading bagged charge
Caliber	114 mm / 4.5 inch
Breech	interrupted screw
Recoil	hydro-pneumatic
Carriage	split trail
Elevation	0° to +65°
Traverse	53°
Rate of fire	Burst: 4 rounds per minute Sustained: 1 round per minute
Muzzle velocity	693 m/s (2,274 ft/s)
Maximum firing range	19,317 m (21,125 yds)
Sights	panoramic, M12

The 4.5 inch gun M1 was a field gun developed in the United States in the beginning of World War II. It shared the same carriage with the 155mm howitzer M1 and fired the same ammunition as the British BL 4.5-inch medium field gun. Beginning in 1944, the weapon was used by the U.S. Army as corps-level artillery; with the end of hostilities, it was declared obsolete.