PT-91U is a modernised MBT PT-91. "U" for "Urbanizowany", i.e. tank to fight in urbanized terrain. Demonstrator for MSPO 2011 military exhibition. This is an offer for the Polish Army which involves certain modifications of the T-72 and PT-91 tanks. The modification includes installation of additional equipment, as remote-controlled cannon with an optical system, an omnidirectional observation system, add-on armour and further engineering equipment. For the weapons systems, the PT-72U is equipped with a remote controlled weapon station armed with a 12.7 mm machine gun, mounted to the crew commander hatch. The system had a fire rotation of 360° and an elevation angle for the gun from -5° to 55°. The observation system is equipped with 8 day-night cameras with the observation angle 55° and a rotary passive camera FLIR which has up to 26 times optical zoom. The armour package is composed by chassis and turret bar armour. The bottom of the chassis is equipped with reactive armour and add-on armour. The PT-72U is also equipped with a full range of new modern internal and external communication tools, which allow communication also via internet. There were also plans to modernize 84 Armenian T-72s to PT-72U standard.