| Year | 1938 |
| Weapon Type | Light Anti-Aircraft Gun |
| Origin & Designer | Denmark/Madsen |
| Numbers Produced | 12 |
| Crew | 5 |
| Calibre | 20mm (20x120) |
| Elevation | -10° to +85° |
| Traverse | 360° |
| Breech | [@breech] |
| Recoil | Short Recoil |
| Gun Sight | [@gun_sight] |
| Gun Mount | [@gun_mounts] |
| Carriage | Two Wheeled |
| Trailers | [@trailers] |
| Gun Shield | [@gun_shield] |
| Armoured Plate | [@armoured_plate] |
| Barrel Length | 1.200mm (L/60) |
| Overall Length | 2.25m |
| Width | [@width] |
| Height | [@height] |
| Weight | Weight in Traction: 317 kg Weight in Action: 260 kg |
| Round Weight | 160 kg |
| Muzzle Velocity | 890 m/s |
| Feed | 15 Round Drum Magazine |
| Magazine Capacity | [@magazine_capacity] |
| Practical Rate of Fire | 150 r.p.m. |
| Rate of Fire | [@rate_of_fire] |
| Maximum Rate of Fire | 350 r.p.m. |
| Maximum Ceiling | 2.950m |
| Maximum Ground Range | 4.700m |
| Maximum Range | [@maximum_range] |
| Armour Penetration | [@armour_penetration] |
| Traction | Motorised (Light Truck) |
| Variants | [@variants] |
| Notes | The 20mm M1938 was a modern anti-aircraft gun and was designed and built by the Danish firm Madsen. The Estonians purchased twelve of these weapons in 1938. |