[PDelaney]

I need some info. The MG being used; is that an MG32 or MG42? is the double canister a double FEED canister or is one side filled with the ammo belt and the other side used to catch the empty shells and feed belt? I remember being on a TDY to Denmark one year and the Danes used the German made MG42 that fired 50 round belts. The belt links were wired together and did not come apart like their American counterparts. When fired, the belt fed in from the left and exited from the right with the spent casings.

Possibly an MG15 with a 75 round saddle drum magazine used in nearly all Luftwaffe aircraft? The magazine was quite complicated as the 7.92 rounds fed alternately from both sides dropping into the bolt from the top of the receiver the spent cases exiting at the bottom (like a lewis, vickers k or bren gun).
You would, however, probably see the odd spent case seemingly fly from the side of the gun...
The MG15 (developed in 1915) had a detachable copper bowl or tube to catch spent cases when used in WW1 aircraft as there were plenty of exposed control wires that could be fouled.



http://en.wikipedia.org/wiki/MG_15_machine_gun

http://www.pbase.com/ouroboris/he111