Power was provided by a Daimler-Benz Model 1910 4-cylinder 55-60 hp gasoline engine, giving a maximum speed of 14 to 18 km/h with range of 65–70 km.

The parts were shipped under the pretence of being boiler plates and agricultural equipment and then assembled in Sweden as the Stridsvagn m/21 (Strv m/21 for short), which was essentially an improved version of the LK II prototype.

The Strv m/21 was powered by a sleeve valve engine located in the front, the driver and crew being in the rear.

Ten of these tanks were built, their armament a single 6.5 mm (0.26 in) Schwarzlose machine gun.

As of 2018, the tank has been restored to running condition, and is now on display at the sv:Försvarsfordonsmuseet Arsenalen in Strängnäs.