It seems that if you want a reproduction late-war German experimental rifle design, you should get in touch with GunLab’s Chuck. Besides his VG-1-5 project which we’ve covered several times in the past, he also mentioned a year ago that he was doing a run of 60 Gerät 05 rifles. These were roller-locked gas-operated rifles patterned off the Gerät 03, which was itself a derivative of the G.43/K.43 (and they, in turn, were derivatives of the G.41(W) rifle). They fed from MP-43 magazines, while having a conventional stock layout.

A result of that project was this cutaway Gerät 05 rifle, which is almost certainly a unique specimen:

For those interested in more information on GunLab’s Gerät 05 project, they can read Chuck’s other posts on the rifle here, here, here, and here. Forgotten Weapons also has a family photo of the roller rifles. While it doesn’t have ever member of the family, it does have most of the experimental ones (reproductions of them, anyway).

By my count, GunLab’s ongoing projects include the VG-1-5, Gerat 06, Gerat 05, and AR-16. That is certainly enough to keep him busy!