The equipment was officially taken into service on 6 September 1943. The gun was fitted in an open topped superstructure on the Canadian Ram tank chassis. Production began in early 1943 and ended in 1945, 2,150 being built. It replaced the 105 mm M7 Priest in British service and continued in use until the late 1950’s.
Gun
| Mark 2 | See 25 pdr towed for details |
| Mark 3 | See 25 pdr towed for details |
Carriage
| Mark 1 | Return roller above mounting |
| Mark 2 | Trailing return roller, revised internal & rear deck layout |
Crew
| 5 including driver |
Data
| See 25 pdr towed for information | |
| Only data different to above given here | |
| Weight in action | 57,000 lbs |
| Total length | 19 feet 3 inches |
| Total width | 8 feet 11 inches |
| Total height | 8 feet |
| Height with canvas top | 9 feet 5 inches |
| Elevation | -9º to +40º |
| Traverse | 25º left & 15º right |
| Recoil length | 20 inches constant |
| Armour | |
| Upper Hull | ½ inch except front flat plate ¾ inch |
| Lower Hull | |
| Sides & Rear | 1½ inches |
| Floor | 1 inch |
| Bulkhead | ¾ inch |
| Sponson | ½ inch |
Performance
| See 25 pdr towed |
Ammunition
| See 25 pdr towed |