From the Dragon Press Release:
To provide a mobile anti-tank capability, the 2.8cm Panzerbüchse 41 was sometimes mounted on halftracks. The 2.8cm sPzB 41 was officially a heavy anti-tank rifle, but its characteristics were actually closer to those of a light anti-tank gun. Production of this weapon took place from 1941 onwards, but manufacturing was discontinued in 1943 due to a lack of tungsten for the projectiles that were fired at very high velocities.

Dragon is going to launch an SdKfz 251/7 Ausf. C armed with a 2.8cm sPzB 41. This latest addition to the SdKfz 251 range offers modelers even greater options. It utilizes accurate and well-detailed components from previous SdKfz 251 kits, as well as the anti-tanks weapon that is accurately designed and molded in a sophisticated level of finesse. This 1/72 pionierpanzerwagen kit pioneers new opportunities for modelers!