Self-propelled Mounts
Two nearly identical vehicle mounted variants – M2 and M3 – were developed based on tube and breech of the M1A1, for use in the 75mm Howitzer Motor Carriage T47 / M8. Both variants had a cylindlical "recoil surface" around the tube. In the M2, the surface was provided by use of a separately manufactured sleeve, while in the M3 it became an integral part of the barrel. M2 and M3 were fully interchangeable. These guns were mounted on the below armored vehicles:
- 75mm Howitzer Motor Carriage T47 / M8 – M2 / M3 in mount M7.
- LVT(A)-4 – M3 in mount M7.
- LVT(A)-5 – M3 in mount M12.
In addition, M1 / M1A1 was mated to a number of other vehicles. Only the T30 reached mass production.
- Medium Tank T5E2 – M1A1.
- Experimental mount on Holt light tractor.
- 75mm Howitzer Motor Carriage T1 (Tank development chassis T2).
- 75mm Howitzer Motor Carriage T3 (Combat Car M1 chassis).
- 75mm Howitzer Motor Carriage T17 (Combat Car M1E3 chassis).
- 75mm Howitzer Motor Carriage T18 (Light Tank M3 chassis) – M1A1.
- 75mm Howitzer Motor Carriage T30 – M1A1 in mount T10.
- 75mm Howitzer Motor Carriage T41 (Light Tank M5 chassis).
Read more about this topic: M116 Howitzer
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