Our take: The Classic Army M249 / MK46 Box Magazine is an auto-winding magazine that holds roughly 2,400 rounds. The magazine is powered by a single 9V battery and is activated by a green button on its underside. Internally, Classic Army redesigned the winding mechanism to have more consistent feeding for every shot.
NOTE: This magazine will work with other brand SAW AEGs with slight modification.
Magazine Capacity: 2,400 rounds
Type: Electric Automatic Winding
Weight: 1.4 pounds
Compatibility: Classic Army M249 / MK46 Models
Package includes: Box magazine, feeding attachment