Tank Destroyer
III
T56 GMC
30,000
0
100%
100%
5%
100%
IV
101/157/38
110/110/175
280
50/14
320
356.52/297.67












3-inch AT Gun M7
12.5
110/110/175
100/100/100
0/0/1.09
1375
101/157/38
93/101/38
792/990/792
720/720/720
AP/APCR/HE
4.8
2.1
40
0.4
2.82
5
25
-15/15
T56 GMC
44
320
primary
Continental W-670
262
17.5
50
14
20
T56 GMC
28
1.1/1.3/2.5
SCR 510
325
Development of a 3-inch self-propelled gun on the M3A3 Stuart chassis started in September 1942. Trials on the Aberdeen Proving Ground in November demonstrated that the gun was too heavy for the light tank chassis. Never entered mass production.