Snail Drum Leather Holster
 

I know these are fakes, all of them unless perhaps canvas constructed, but this might be worth it for the dust cover. https://www.proxibid.com/asp/LotDeta...ather-Holster#

The metal object shown in this auction is an MP18 adaptor for the snail drum. A dust cover is a little different...

My mis-identification corrected...
 

Oops, you're right Jerry. Initial lack of adequate scrutiny here... Adapters pretty collectible, too, right? Auction description lists it as a "loading tool"!

I bought one of the leather ones, but you can not put the snail mag in the leather case with the dust cover on because of the fit. I guess you could force it in but you would not get the dust cover back out.

Good thing to know, when considering one of these fantasy pieces. Wouldn't want to get a $200 dust cover lodged in there. the mag wouldn't need a dust cover if already in one of these holster thingies--would seem well enough protected.