First issued in April 1940, the 25 pdr Gun Mark 2 was first used in action in the Norway campaign. It continued in first line service with only minor changes until 1967 and was used for training until 1975. The only major change to the gun was the fitting of a two port Solothurn muzzle brake in 1942. This was done to allow the use of Charge Super with the Armour Piercing Shot. It was rarely fitted to any 25 pdr Gun Mark 2 in the Far East and not at all (even post-war) to Australian and New Zealand guns
Gun
| Mark 1 | Loose liner in 18 pdr Mark 4 gun |
| Mark 2 | Standard pattern |
| C Mark 2 | As Mark 2 but Canadian built |
| Mark 3 | Introduced January 1944. Shot seating reduced |
| C Mark 3 | As Mark 3 but Canadian built |
| Mark 4 | Introduced October 1946. As Mark 3 but breech ring altered |
| Mark 5 | Not used |
| Mark 6 | Introduced November 1964. Breech ring of high quality steel |
Carriage
| Mark 1 | Humped box trail with platform |
| Mark 2 | Indian design. Narrower wheel track and smaller No. 22 platform |
| Mark 3 | Canadian, introduced late 1944. Narrow track and shield. Trail hinged in middle to give extra 30º elevation. No. 22 platform |
| Mark 4 | British design based on Australian “Short” model. Introduced May 45, obsolete September 1946. Only 1 or 2 made. Note – narrow track versions for jeep towing on jungle tracks and for loading into Dakota aircraft without dismantling |
Crew
| No.1 | Detachment Commander – moves trail |
| No.2 | Breech Operator – rams shell |
| No.3 | Layer – fires gun |
| No.4 | Loader |
| No.5 | Ammunition preparation |
| No.6 | Ammunition & Fuze setter |
Data – Mark 2/3 on Carriage Mark 1
| Weight of gun & breech mechanism | 1,000 lbs |
| Weight in action | 3,968 lbs |
| Total length including muzzle brake | 106.72 inches |
| Length of bore | 92.375 inches |
| Rifling | 26 grooves uniform right hand 1/20 |
| Breech mechanism | Vertical sliding block |
| Elevation | -5º to +40º |
| Traverse | 4º left & right |
| Recoil system | Hydropneumatic variable |
| Recoil length | 20 to 36 inches |
Performance
| With 25 lb High Explosive shell: | |
| Muzzle velocity | 1,700 feet/second charge super |
| Maximum range | 13,400 yards |
| With 20 lb Armour Piercing Shot: | |
| Muzzle velocity | 2,000 feet/second |
| Penetration | 70 mm at 400 yards 0% impact |
Ammunition
| Shell High Explosive Mark 1D | Standard 25 lb projectile |
| Shell High Explosive Mark 2DT | As Mark 1D with tracer in the base |
| Shell Smoke Base Ejection Mark 1A | Fuze Time & Percussion No 220 |
| Shell Smoke Base Ejection Streamlined Marks 1-6D | Replaced Mark 1 early 1941 |
| Shell Smoke Base Ejection Mark 7D | Designed as chemical shell. Training use only |
| Shell Smoke Coloured Base Ejection Marks 1-2D | Issued 1944. Red, yellow, green or blue smoke |
| Shell Flare Target Recognition Base Ejection Mark 1D | Similar to coloured smoke but brighter flame |
| Shell Incendiary Base Ejection Mark 1D | Rarely used in action |
| Shell Star Base Ejection Mark 1D | Developed 1943. Parachute flare, 25-30 seconds burning time |
| Shell Propaganda Base Ejection | Local conversion in N Africa |
| Shot Armour Piercing Marks 1-6 & 8T | Solid steel 20 lb shot with tracer |
| Shot Armour Piercing Capped Mark 7T | Never manufactured or issued |
| Propelling Charge | |
| 3 part in brass case plus Super Charge and increments | |