It's our old buddy Ken (revshop) selling this. Nobody has been able to figure out his pricing, except that I've never seen a bargain offered. For this kind of dough, I'd expect the entire setup--trommel magazine, loader, dust cover, machine gun adapter,
and perhaps even a shooter Luger!
BTW, here's the link:
http://www.ebay.com/itm/Luger-Artill...QAAOSwT5tWKrmx
This one is strangely configured, seems to be missing the top side-link things which would be fastened in the empty holes, and that tabbed plunger is weird. I will wait for comments from someone more experienced/knowledgeable about this accessory to explain.