The Gewehr-Panzergranate was a shaped charge rifle grenade that was developed by Germany and used by the Wehrmacht during World War II.
Design.
The Gewehr-Panzergranate was launched from a Gewehrgranatengerät or Schiessbecher ("shooting cup") on a standard service rifle by a blank cartridge. The primary components were a nose cap, internal steel cone, steel upper body, aluminum lower body, rifled driving band, TNT filling, and a PETN base fuze. 
The Gewehr-Panzergranate was an anti-armor weapon which upon hitting the target ignited the PETN base fuze which in turn ignited the TNT filling which collapsed the internal steel cone to create a superplastic high-velocity jet to punch through enemy armor. Since shaped charge weapons rely on chemical energy to penetrate enemy armor the low velocity of the grenade did not adversely affect penetration. A downside of the Gewehr-Panzergranate was its short range .
References.
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