the production of the prototype variant of the Leopard 2PLM1. The vehicle was delivered in January 2021, and its tests began in February 2021. The differences in the field of tanks in the Leopard 2PL and Leopard 2PM1 versions are that the machines in the 2PLM1 version are equipped with an EGPT compartment warning system, a system protecting the network electronics against the start-up time, modification operating modes of the laser rangefinder, an additional socket for batteries and the PIX combination, allows the commander to automatically rotate the optoelectronic head of the PERI observation and aiming device to the "six o'clock" and "twelve o'clock" position relative to the tank's hull. Armor The modernization of the Leopard 2A4 to the 2PL standard includes the strengthening of the ballistic resistance of the turret to a level exceeding that of the Leopard 2A5 version. Additional external armor modules are mounted around the vehicle turret. It was not decided to reinforce the hull and vehicle chassis due to the significant increase in vehicle weight and cost reduction. Special anti-splinter liners have been installed inside the vehicle to protect the crew inside the vehicle against splashes and armor fragments in the event of a puncture or hit. Armament The main armament of the tank remained the Rheinmetall Rh-120 smoothbore gun in the L/44 version, but it was modified to adapt to the use of new types of ammunition, i.e. DM63 armor-piercing shell and programmable DM11 ammunition. Left and right resistors, return, recoil indicator and container for shell bottom were replaced, in order to use DM11 ammunition, a programming system was introduced in the cannon's falling-block action, as well as a fire control system and electronic cannon trigger assembly. A new on-board computer was installed with new ballistic tables. MG-3 machine guns were not exchanged for another model. The two plane gun stabilizer system of the cannon and turret drives were changed from hydraulic to purely electric. Optics The gunner's sight and sights of the gunner and the commander were modernized by adding Polish thermal imaging cameras of the third generation KLW-1 Asteria made by Polish PCO. Driver awareness has also been improved by installing a KDN-1 Nyks day / night reversing camera also PCO production. A monitor-control panel for the commander was installed, which enables: alternative image transmission from the modernized EMES 15 sight and PERI R17A3L4 CP instrument and performing a full test of