Actually most of the experimental rifles remind me of the G-3 rather than the AK-47.
Which is hardly a suprise as Mr. Heckler and Mr. Koch worked for Mauser in WW2.
But there's some really bad german in that article: "Wehrspartigewein" could mean "Wehrsportgewehr", which would be "military sports rifle".
But my favorite is this:
3 kg Rollbombe. In order put the bowling skills of many germans to good use...
Actually it was a sapper weapon, for use against Bunkers, and came in various sizes up to 10 kgs.
The "Einstossflammenwerfer" had a worthy successor in oscurity with the "Handflammpatrone" of the Bundeswehr, some kind of oversized one shot flare gun that fired a phosphorous charge up to 30 meters. I've never seen one and I don't know anyone who has ever seen one, but supposedly this one-shot one hand flamethrower was in service until 2001. Maybe sapper units had them...