By the end of WW2 the German Luftwaffe had a big storage of unused 20mm aircraft cannons and the Wehrmacht was in desperate need of AA-vehicles. So three of the belt fed MG151/20 were mounted together in a 251/D Halftrack. The weapon was quite effective, also against ground targets. The biggest disadvantages were the cramped space inside the vehicle, the very simplified way to move the gun (with the gunners body weight) and the unsufficent armor protection for the crew.
This is a metal conversion kit by Rubicon Models for their very good plastic kit of the Sd.Kfz. 251/D.
The gunner wears a version of the late-war anti-Infrared Leibermuster dress, which was issued in very limited numbers during the last weeks of WW2.
Cheers from Bavaria
Thomas