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Manufacturer: Oerlikon (Swiss) License built by Borno, Rheinmetall Borsig, and Mauser Feed Type: Drum Caliber: 20mm Weight: 53 Lbs. Length: 52.8 In. Muzzle Velocity: – MG FF: ~600 m/s – MG FF/M: ~585 m/s (with AP or HE) – MG FF/M: ~700 m/s Rate Of Fire: – MG FF: 520 rpm – MG FF/M: 540 rpm Round Types: – High Explosive – Incendiary – Armor Piercing – MG FF/M: HE/M (high explosive mine shell) Round Weights: – MG FF: 134 g – MG FF/M: 90 g HE/M 4.82 Oz. (Explosive)
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Comments: The 20mm MG FF was developed by Ikaria of Germany in 1936 as a derivitive of the Swiss Oerlikon FF F cannon, which was license-produced in Germany. The weapon suffered some drawbacks in that the drum feed mechanism limited its usefulness in fighter by limited ammunition capacity, initially limited to 60 round but later raised to 90 rounds per gun. The MG FF/M was a variant developed to fire a high explosive mine shell (Minengeschoss) that featured a projectile with thinner walls with a greater explosive capacity. The projectile was lighter and developed less recoil than standard rounds and the recoil mechanism had to be adjusted to compensate. Unfortunately this adjustment meant that the MG FF/M cannon could not fire the heavier MG/FF rounds without risk of serious damage.
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