Oerlikon KCA

The Oerlikon KCA is a Swiss 30 mm (1.181 in) gas-operated single-barrel revolver cannon developed for aircraft use. Its most noticeable use was on the Saab 37 Viggen fighter mounted on a conformal pod. The KCA fires a 30 mm × 173 mm (1.181 in × 6.811 in) shell that is 50% heavier than the NATO standard ammunition used on ADEN and DEFA cannon. It can fire up to 1350 rounds per minute at a muzzle velocity of 1030 m/s, with an effective range of 2,500 m (8,200 ft)

Oerlikon KCA
Type	Automatic cannon
Specifications
Mass	136 kg (300 lb)
Length	2.69 m (8 ft 10 in)
Barrel length	1.98 m (6 ft 6 in)
Shell	30 x 173mm
Calibre	30mm
Barrels	1
Action	Four-chamber revolver
Rate of fire	1,350 rounds/min
Muzzle velocity	1,030 m/s (3,400 ft/s)