No reason to ask wirbelwind with reload handicap if you can have
this one...
http://www.leadwarrior.com/Lw35017h.htmSpecifications
Sd.Kfz.251/21 Fliegerabwehr Schützenpanzerwagen (Drilling)
Crew: radio-operator, driver, loader and gunner
Max Speed 32.5 mph
Armament: three MG151/15 or MG151/20
Ammo: outer guns 250, inner 400 (500?), total 2000 rounds
Gun Specifications
Designation: MG 151/15 ( MG 151/20)
Manufacturer: Waffenfabrik Mauser AG
Caliber: 15,1 mm (20 mm)
Length: 1917 mm (1767 mm)
Weight: 42 kg (42,3 kg)
Muzzle Velocity: 850! m/s (790 m/s)
Rate Of Fire: 850 rounds per minute (780 rnds/min)
Round Types: Explosive/Incendiary, Armor Piercing, Armor Piercing/Electron Encendiary
Round Weights: 72 g (117 g)