Drum magazine assembly and methods

A drum magazine assembly for a firearm, the drum magazine assembly comprising:

• a drum assembly comprising a wheel;
• a spindle assembly;
• a feed tower assembly;
• an advancing mechanism to advance the wheel such that one or more cartridges of ammunition may be loaded after advancing the wheel;
• a follower assembly;
• and
• the drum assembly shaped to constrain cartridges therein to have substantially a same first focal point and that first focal point being further from a front of the drum magazine assembly than a point where a focal axis of a leading cartridge of the feed tower assembly intersects an axis passing through a center of the drum assembly and the first focal point.

A drum magazine assembly for a firearm, the drum magazine assembly comprising:

• a drum assembly comprising a wheel;
• a spindle assembly;
• a feed tower assembly angled forward relative to a plane through a front or back face of the drum assembly;
• a follower assembly;
• and
• an advancing mechanism to advance the wheel such that one or more cartridges of ammunition may be loaded after advancing the wheel, wherein
• an angle α between a drum axis through a center of the drum assembly and the focal axis of the leading cartridge in the feed tower, is between 0 and 15 degrees less than an angle β between a line from the leading cartridge to the drum focal point and focal axis of the leading cartridge in the feed tower.