Hi stumpy,
The videos show that by extensively modifying Marushin's XM177 internals, the model can be set up to fire well. They aren't brilliant right out of the box.
They also show Lucifer's own "X-Type" cartridge which looks like a complete round including a "bullet."
This cartridge is a marvel in its own right considering it's home made.
Lucifer has posted several videos showing home made titanium cartridges for Marushin's MP40, extensive modifications to Hudson's Skorpion including custom carts, the XM177 and also Marushin's M712 Mauser and cartridges. This last one's in English which should explain the development of all his projects a bit better.
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Cerwyn
Hobby collector of Replica model guns and Militaria.
also member of Living History Reenactment Groups.