The 30.5 cm Mantel Ring Kanone L/22 was a 30.5 cm 22 caliber long Krupp Mantel Ring Kanone (MRK). It was a rifled breech loader built-up gun with a Krupp
minister explained that the 30.5 cmMRKL/25 gun could penetrate a 40 cm thick armor plate at 2,900 m while a 28cm gun could only do this up to a distance