Includes:
1 - MG34
1 - Gurttrommel (Dual Drum Magazine) fits into MG34
1 - Gurttrommeltrager (Spare Dual Drum Magazines and holder) 
 
Which MG-34 do I need?
MG-34 Standard - used by infantry and mounted on soft skin vehicles
MG-34 Panzerlauf - used on Panzers like the Tiger, Panzer IV, King Tiger, etc.
MG-34/41 aka MG-34S - A late war version of the standard MG-34 with shorter barrel that increased the effective firing rate.