Development of the gun began in 1936, with the contract being awarded to Rheinmetall Borsig, the first prototype gun was delivered for testing in late 1937 and completed testing successfully.
Development of the gun began in 1936, the first prototype gun was delivered for testing in late 1937. This was with the contract. This contract was being awarded to Rheinmetall Borsig. Development of the gun began in 1936, the first prototype gun was completed testing successfully. This was with the contract. This contract was being awarded to Rheinmetall Borsig.