The Karl “Gerät” (device) was a huge self-propelled siege mortar. The 60cm shells weighed around 5000 pounds and contained several hundred pounds of explosives. Hasegawa says that the Karl made a “significant impact” wherever it was used. The problems with Karl were that it wasn’t very mobile, and it required special ammunition. When a Karl was in use, it had to be in a special firing position, which should be level and support the chassis.
This is Hasegawa’s release of their Karl Mortar in 1/72. It includes the “Munitionschlepper” Panzer IV. This kit has been released before, with the Munitionschlepper or with the railway transport add-on. What makes this kit desirable is that you get more options for the basic Karl mortar.
The two big options are: