Gun variants:
T7, standardized as M3.

T10 - variant with elevation increased to 65 degrees.

Carriage variants:
M3 - based on M3A1 carriage for the 75 mm field howitzer.

M3A1 - had stronger trails, made from 1/8 inch plate instead of 3/32 inch.

M3A2 - was fitted with shield.
Gun variants:
T7, standardized as M3.
T10 - variant with elevation increased to 65 degrees.
Carriage variants:
M3 - based on M3A1 carriage for the 75 mm field howitzer.
M3A1 - had stronger trails, made from 1/8 inch plate instead of 3/32 inch.
M3A2 - was fitted with shield.
M3 howitzer