StrSk 121 Main Battle Tank
This tank is a variant of the "Lyle K4" developed by another country.

Its primary weapon is a 120mm BS-K20 main gun, with a secondary 12.7mm coaxial machine gun. The tank fires the MK-SE1 armor-piercing fin-stabilized discarding sabot round (an advanced version of the MK-SE armor-piercing round).

The top of the tank is equipped with an SUR automated combat platform. The platform's primary weapons are two 20mm anti-aircraft autocannons, while its secondary weapons consist of two light infantry vehicle-mounted anti-aircraft missiles (laser-guided).

This model features an electro-optical active protection system and smoke grenade launchers installed on the frontal section of the turret. The side skirts are fitted with "Fiber-3" reactive armor, overlaid with a layer of homogeneous armor. The frontal hull is protected by "Fiber-1" reactive armor.

The reactive armor, automated cannon system, and other modifications were all implemented by the recipient country after export and are not associated with the original manufacturing nation.

The base model of this tank is the Lyle K4H, which is characterized by two radiators mounted on the turret and a reload time of 6.3 seconds.

The MK-SE1 armor-piercing round used by this tank is nearly comparable in performance to the MK-SEX armor-piercing round.

The StrSk 121 is primarily designed for urban combat. The explosive reactive armor installed on its sides is intended to counter infantry anti-tank systems and various light anti-armor weapons. Additional armor plates have also been added to the sides of the front windshield.