The next major mark to appear was the Oerlikon S model of 1927. This product retained the 20x110mmRB chambering but saw its muzzle velocity raised for better penetration value allowing it to be used in a dual-purpose role (against both air and land targets). The Oerlikon 1S followed in 1930 and was categorized as an improved version. The Oerlikon AF and Oerlikon AL models were introduced as dedicated aircraft weapons to be fitted on trainable mountings and a 30-round drum was introduced for this application.
A fixed aircraft mounted version debuted in 1935 as the faster-firing Oerlikon FF (firing at about 520 rounds per minute) and variable ammunition drums were offered that spanned from 45 to 100 round counts. This model was chambered for the 20x72mmRB projectile. The localized German version became the famous MG FF cannon fit though chambered for 20x80mmRB projectiles. The FF in Japanese naval service became the Type 99-1. The similar Oerlikon FFL had its rate-of-fire reduced (to 500rpm) but fired a heavier 20mm projectile. The Japanese naval equivalent became the Type 99-2. The heaviest projectile fired came from the Oerlikon FFS model which saw a further reduction in rate-of-fire (470rpm).
The Oerlikon FFS was evolved in 1938 to become the classic naval Oerlikon SS which featured a 650 rounds-per-minute rate-of-fire. The SS model became the naval standard of World War 2 fighting. During 1942, the Oerlikon 1SS debuted and, in 1945, the Oerlikon 2SS model followed - both products attempting to increase rate-of-fire values.
Amazingly, the Oerlikon product still remains in service today (2015) despite its original showing in the Great War. Such longevity for a military weapon displays the design's excellent internal function, battlefield versatility, and tactical appeal. Modernized forms will only continue the line that has produced a "100-year weapon" - something of a true rarity in the realm of military service.
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