Mauser Model E autocannon with feed chute.
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The Model E is an autocannon of German origin. It was developed by Mauser as a more powerful successor of the Rh-202 as vehicle armament. Unlike the Swiss Oerlikon KBA, which fires the same type of 25mm ammunition, the Model E never saw widespread service. Instead the larger Model F was adopted in several vehicle designs.
The Model E is a down-scaled variant of the 30mm Model F, which nowadays is better known as the MK 30. The Model E was downsized to fire the 25x137mm round. The Model E retains the gas operated design which operates both the unlocking and cycling of the action and the cycling of the belt feed mechanism. Unlike the Model E there are no variants for other applications than combat vehicle armament.
The Model E is chambered for the 25x137mm NATO round. The dual feed mechanism allows for rapid switching between two types of ammunition. Cyclic rate of fire is rather high at 900 to 1.000 rpm.
The Model E was proposed to replace the 20mm Rh-202 in German service. The Model E could be retrofitted to the Marder 1 mechanized infantry combat vehicles and be used in new vehicle designs. Rapid improvements in Soviet combat vehicles led to the larger caliber Model F to be selected instead, with the Model E losing the competition to the widely used Oerlikon KBA.
The Oerlikon KBA is a direct competitor to the Mauser Model E. Both guns fire the 25x137mm round at a high rate of fire.
While the 25mm Model E never saw any use, its larger brother did. The Model F, later known as MK 30, has seen use in various combat vehicles and anti-aircraft guns.
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