My collector buddy stopped by today with this

[Peter S]

Originally Posted by gunbugs

Apparently the Germans used regular flare pistols, and manufactured the folding stock and clamp on sight arrangement, so you could fire anti personnel or anti tank grenades. It took my friend a long time to come up with all the correct original parts.

No, they didn't use a regular flare pistol with this rig. They used a "Z" pistol which is a flare pistol that has a rifled barrel.