1878 to 1882 Krupp designed and tested the 15 cm MRK L/30 and 15 cm MRK L/35. These were rifledbreechloader built-up guns (Mantel Ring Kanone) that showed
15 cm Mantel Ring Kanone L/30, known as 15 cm Kanone L/30 was a 15 cm 30 caliber long Krupp Mantel Ring Kanone (MRK). It was a rifledbreechloader built-up