The gunner is provided with the Slovenian Fontana SGS-55 two axis stabilised day/image intensification sight with a laser range-finder which feeds information to the fire-control computer. In the first mode all the crew have to do is manually insert the type of ammunition to be used. The fire-control system has three modes of operation, automatic, semi-automatic and manual. The 105 mm barrel has been fitted with a three part thermal sleeve which is said to reduce barrel bending by over 70 per cent so helping to increase accuracy of the weapon.Ī new computerised fire-control system has been installed in the M-55 S1 MBT which is claimed to allow stationary and moving targets to be engaged with a high first round hit probability while the tank itself is stationary or moving. The roof mounted 12.7 mm machine gun is retained. The 105 mm L7 gun is fired electrically as is the 7.62 mm machine gun mounted coaxially with the main armament. The standard 100 mm D-10T rifled gun has been replaced by a 105 mm L7 type rifled tank gun which can fire a wide range of ammunition types including High Explosive Anti-Tank - Tracer (HEAT-T), Armour Piercing Fin Stabilised Discarding Sabot - Tracer (APFSDS-T) and High Explosive Squash Head - Tracer (HESH-T). The upgrade carried out in Slovenia covers the three main areas of the vehicle, armour, mobility and firepower. The overall layout of the upgraded T-55 S1 MBT is virtually identical to the Russian T-54/T-55 MBT covered in detail in an earlier entry.
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