The MK 108 mechanism was scaled up in the MK 112 cannon, using a 55×175RB cartridge. The MK 112 was intended to be fitted in pairs in the nose of Me 262 fighters, with 25 rounds per gun, and also in the nose of Arado 234. Under-wing mounts for Dornier 335 were in development as well. The gun was not finished in time to see operations in WWII. Only 15 prototypes were built; of these 10 were delivered for tests and 5 were kept at the factory for improvements based on expected feedback. Of the ten guns delivered for tests, seven were of an early model, weighting 660 lbs, and three were lighter at 605 lbs. The projectile was supposed to weight 3.3 lbs; of these 14.8 ounces were reserved for the explosive. The US captured some of these prototypes and they were used for the experimental US 57 mm T78 auto-cannon, but this did not see production either.
Weight: 660 pounds (300 kg), 605 pounds (274 kg) (improved version)
Length: 80 inches (2,000 mm)
Cartridge: 55 × 175RB mm
Calibre: 55 mm
Action: Blowback operation
Rate of fire: 300 rounds/min
Muzzle velocity: 594 m/s (1,950 ft/s)