Housing for a cartridge magazine for a firearm and cartridge magazine for a firearm

A cartridge magazine for a firearm, the cartridge magazine comprising:

• a housing for the cartridge magazine which extends along an X-axis, a Y-axis and a Z-axis and which, in its inside forms an interior space consisting of a first region and a second region, wherein between the first region and the second region a transitional region is formed which connects the first and the second region with one another;
• wherein the interior space is limited by inside surfaces of a front wall, a rear wall, a first side wall and a second side wall;
• wherein the inside surface of the front wall extends in the direction of the Z-axis in at least one of the regions along a first circular path;
• wherein the inside surface of the rear wall extends in at least one of the regions in the direction of the Z-axis along a second circular path;
• wherein the inside surfaces of the front wall and the rear wall in at least one of the regions are located at a first distance (A) from one another;
• wherein the housing has a housing bottom side and a housing top side, magazine lips are formed on the housing topside and the housing bottom side is at least partially open;
• wherein the cartridge magazine includes a bottom cover which is suitable to at least substantially close off the at least partially open bottom side of the housing;
• a first feeder;
• a second feeder;
• the feeders allowing the second feeder to be movable at least partially into a space of the first feeder;
• a first spring located between the first feeder and the bottom cover;
• and
• a second spring located between the first feeder and the second feeder, the first region accommodating four stacks of cartridges arranged directly adjoining one other and offset in a Z-direction relative to one another, and the second region accommodating two stacks of cartridges arranged directly adjoining one another and offset in the Z-direction to one another,
• wherein the inside surface of the front wall has a first protrusion which protrudes in direction of the X-axis into the interior space of the housing and extends along the Z-axis originating from the transitional region at least partially into the first region and also at least partially into the second region, and the inside surface of the rear wall has a second protrusion which protrudes in direction of the X-axis into the interior space of the housing and which along the Z-axis features a start in the first region and an end in the transitional region or in the second region.