The M3 was produced in parallel with the M2, and it eventually became the standard APC, seating an infantry squad in the rear, along with 3 more soldiers in the control compartment. Its body was longer than the M2, and it housed an aft door for quick loading and unloading. Its7.62mm machine gun was mounted on a removable column and controlled from therear roof compartment. The standard model came with a pulleyor winch on the front of the body.
In addition, the center of the body
provided a rack
for mounting an anti-aircraft gun. The M3 had an armored hull of thick steel,12.7mm around the sides tapering to 6.4mm in the rear. The M3
clocked up to 72 km/h.
Over 31,000 of these vehicles were produced.