| Year | 1941 |
| Weapon Type | Light Anti-Aircraft Gun |
| Origin & Designer | Switzerland/Britain |
| Numbers Produced | [@numbers_produced] |
| Crew | 3 |
| Calibre | 20mm L/70 (20x110RB) |
| Elevation | -10° to +75° |
| Traverse | 360° |
| Breech | [@breech] |
| Recoil | Spring |
| Gun Sight | Ring Sight |
| Gun Mount | [@gun_mounts] |
| Carriage | HB Mk. I Mount |
| Trailers | [@trailers] |
| Gun Shield | [@gun_shield] |
| Armoured Plate | [@armoured_plate] |
| Barrel Length | 2.24m |
| Overall Length | [@length] |
| Width | [@width] |
| Height | [@height] |
| Weight | Weight in Transit: 510 kg Weight in Action: 366 kg |
| Round Weight | 125g (HE) |
| Muzzle Velocity | 820 m/s |
| Feed | 60 Round Drum |
| Magazine Capacity | [@magazine_capacity] |
| Practical Rate of Fire | 320 r.p.m. |
| Rate of Fire | [@rate_of_fire] |
| Maximum Rate of Fire | 450 r.p.m. |
| Maximum Ceiling | 3.050m |
| Maximum Ground Range | 4.389m |
| Maximum Range | [@maximum_range] |
| Armour Penetration | [@armour_penetration] |
| Traction | Motorized (Light Truck) |
| Variants | [@variants] |
| Notes | Initially designed in Germany and the patent sold to a Swiss firm, the Oerlikon became one of the most widely used light anti-aircraft guns in World War Two. It was mounted on naval vessels and aircraft plus issued to ground units. |