US Army M-48 Tank.
Main armament of the M48A3 is an M41 (T139) 90 mm M41 gun, which consists of the barrel, evacuator chamber, blast deflector and breech mechanism assembly. The breech block is of the vertical sliding type with an inertia percussion firing mechanism. The barrel has a life of 700 equivalent full charge rounds. The following types of fixed rounds can be fired, but it should be noted that not all are currently in use: APERS-T (M580), APC-T (M82), AP-T (M77), AP-T (M318), Canister (M336), Canister (M377), HE-T (M71), HEAT-T (M431), HEAT (M348/M348A1), HVAP-T (M332A1), TP-T (M353) and Smoke WP (M313).
A total of 19 rounds of 90 mm ammunition is stowed to the left of the driver with a further 11 rounds to his right, eight horizontally on the turret floor, 16 stowed vertically around the turret ring and the remaining eight for ready use in the turret.
Mounted coaxially to the left of the main armament is a 7.62 mm M73 machine gun (earlier models have the 7.62 mm (0.30) M1919A4E1 weapon), and mounted in the commander's cupola is a 12.7 mm (0.50) Browning M2 HB machine gun which can be elevated from -10 to +60°, and can be aimed and fired from within the cupola.