Includes:
1 - MG-34 MG-34t Panzermantle Heavy Barrel (Panzerlauf)
1 - Gurtsack (open)
1 - Ammo belt (for Gurtsack)
1 - Gurtsack (closed)
1 - Fliegerbeschussgerät (Mounting bracket for Panzers with working anti-aircraft elevation) 
 
Which MG-34 do I need?
MG-34 Standard - used by infantry and mounted on soft skin vehicles
MG-34 / MG-34t Panzerlauf - used on Panzers like the Tiger, Panzer IV, Panther, 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.
 
Finished model as assembled, detailed and photographed by Steve Dohm.