It was apparently fitted to 251/1 half tracks in service on the eastern front.
Seven parts total, manufacturer unknown.
The wheels could be lifted and the weapon fired from the prone position; some sources list it as a heavy anti-tank rifle. It first saw service in the western desert, and was used by a variety of units including paratroopers. Maximum effective range was about 500 yards, it could fire 8-10 rounds per minute. A nice little addition indeed.