| Year | January 1944 |
| Weapon Type | [@type] |
| Origin & Designer | [@designer] |
| Numbers Produced | 139 |
| Crew | Sergeant/Section Chief + .30 cal M1 Rifle. Corporal/Gunner + .30 cal M1 Carbine. Pvt/Assistant Gunner + .30 cal M1 Carbine. 8 x Pvts/Cannoneers + .30 cal M1 Carbines. Pvt/Gun Mechanic + .30 cal M1 Carbine. Corporal/Ammunition + .30 cal M1 Carbine. 9 x Pvts/Ammunition Bearers + .30 cal M1 Carbines. 2 x Pvt/Drivers (Towing Vehicles) + .30 cal M1 Rifles w/M7 Grenade Launchers. |
| Calibre | 203mm |
| Elevation | -10° to +50° |
| Traverse | 30° |
| Breech | Interrupted Screw |
| Recoil | Hydropeumatic |
| Gun Sight | M12 |
| Gun Mount | [@gun_mounts] |
| Carriage | M1: Split Trail |
| Trailers | [@trailers] |
| Gun Shield | [@gun_shield] |
| Armoured Plate | [@armoured_plate] |
| Barrel Length | 10.160mm (L/50) |
| Overall Length | [@length] |
| Width | [@width] |
| Height | [@height] |
| Weight | Weight in Transit: Two Loads - 22.276 kg (Barrel) 21.273 kg (Carriage) Weight in Action: 31.434 kg |
| Round Weight | HE (M103) 109.03 kg. Bagged Charge 48 kg. |
| Muzzle Velocity | 870 m/s |
| Feed | [@feed] |
| Magazine Capacity | [@magazine_capacity] |
| Practical Rate of Fire | [@practical_rate_of_fire] |
| Rate of Fire | 1 r.p.m. |
| Maximum Rate of Fire | [@maximum_rate_of_fire] |
| Maximum Ceiling | [@maximum_ceiling] |
| Maximum Ground Range | [@maximum_ground_range] |
| Maximum Range | 32.000m |
| Armour Penetration | [@armour_penetration] |
| Traction | Motorised (M6, M33, M34 & M35 Tractors) |
| Variants | [@variants] |
| Notes | The M1 gun shared a similar carriage to the M1 240mm howitzer and was introduced in the same year but not standardized until early 1944. The M1 gun had a greater range than the M1 240mm howitzer but suffered from excess barrel erosion. The first guns were sent to Italy and used in the counter battery role. It also served in Northern Europe and the in the Philippines. |