M15, M15A1 Multiple Gun Mortar Carrier
680 were built by Autocar in 1942.
Chassis was M3 Half-track.
37 mm gun had ceiling of 6,200 yards, range of 8,875 yards. The .50 cal MGs had range of 7,200 yards.
Had 37 mm M3E1 on top and 2 .50 cal MGs combined in a mount with gun shield.
Used in Tunisia.
M15

37 mm M1A2 Gun in a Combination Gun Mount, M42. Used a M6 Sighting System.
M15A1

37 mm M1A2 Gun in a M3A1 Gun Carriage with a M5 Sighting System.
Had altered gun mount and produced from August 1943. Was lighter and had lower silhouette than M15. Platform provided for the loader and lead setter. Rail is provided at rear to help crew get into gun mount.
| M15 | M15A1 | |
|---|---|---|
| Crew | 7 | |
| Physical Characteristics | ||
| Weight | 9.45 tons1 | 20,800 lb |
| Length w/gun | 6.27 m1 | 20' 3.5" |
| Length w/o gun | ||
| Height | 2.39 m1 | 7' 10" |
| Width | 2.24 m1 | 7' 4.5" |
| Ground clearance | 11 3/16" | |
| Ground contact length | 3' 10.75" | |
| Ground pressure | ||
| Turret ring diameter | ||
| Armament | ||
| Main | 37 mm M1A21 | 37 mm M1A2 |
| Secondary | ||
| MG | 2: .50 cal MG1 | 2: M2 .50 |
| Side arms | 4: .30 cal Carbines | |
| Quantity | ||
| Main | 200 | |
| Secondary | ||
| MG | 1,200 | |
| Side arms | ||
| Armor Thickness (mm) | Front: 121 Side: 01 |
|
| Hull Front, Upper | 6 | |
| Hull Front, Lower | 6 | |
| Hull Sides, Upper | ||
| Hull Sides, Lower | ||
| Hull Rear | ||
| Hull Top | ||
| Hull Bottom | ||
| Turret Front | 6 | |
| Turret Sides | 6 | |
| Turret Rear | ||
| Turret Top | ||
| Engine (Make / Model) | White 160AX | |
| Cylinders | ||
| Net HP | 1281 | |
| Transmission | ||
| Fuel type | ||
| Octane | ||
| Capacity | ||
| Performance | ||
| Traverse | 360° | |
| Max Speed | 67 kph1 | |
| Cross Country | ||
| Road radius | ||
| Turning Radius | ||
| Elevation Limits | -5° to 85° | |
| Fording depth | ||
| Trench crossing | ||
| Vertical Obstacle | ||
| Suspension (Type) | ||
| Wheels each side | ||
| Return rollers each side | ||
| Track length | ||
| Tires | ||
| Track width | ||
| Track centers/tread | ||
| Production | Autocar |
Sources:
- Jane's World War II Tanks and Fighting Vehicles The Complete Guide, Leland Ness, 2002
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