Further to the above, here are some real world upgrades:
Slovenian M-55S: The original 100 mm tank gun was replaced by the 105 mm one with a thermal sleeve. The armour protection of the tank was improved considerably by attaching Rafael ERA blocks to the hull and the turret. A digital ballistic computer was installed in order to improve the fire control system (FCS). Modernization of the V-12 diesel engine resulted in an increase in power from 520 hp to 600 hp.
Ukrainian T-55AGM: The tank is fitted with a 5TDFM, two-stroke liquid-cooled multi-fuel supercharged diesel engine with boxing pistons which develops 850 hp (634 kW). It has built-in explosive reactive armour, countermeasures system and two main armament options: 125 mm KBM1 smoothbore gun or 120 mm KBM2 smoothbore gun (120mm version shown below):
Cadillac Gage Textron Jaguar: It had a newly designed turret. The hull top was new. The engine compartment and fuel tanks on the shelves over the tracks were armour-protected. The Soviet-made 100 mm gun was replaced with the American M68 105 mm rifled gun fitted with a thermal sleeve and a Marconi fire control system which was originally developed for the American light tank Stingray was fitted.
