A&K - M249 2400 Round Electric Box Magazine - Olive Green is a High Capacity Box Magazine for A&K Brand Airsoft 6mm BB M249 Light Machinegun, and is designed to hold thousands of BBs. The magazine is constructed from Polymer with Alloy Feed tubes. The Magazine features an Electronic Winding System, allowing the user to keep firing without having to stop to re-wind magazines, allowing you to keep targets heads down when you need it most. The magazine is powered by 2x AA Batteries, and can either be used in a Push Button activation mode or via a Sound Activated Mode. This box magazine is a great replacement or spare for those who have an M249, and always like to have a spare handy should their main Box Magazine become damaged or broken, or even for those who simply can't put enough rounds down range. Remember: if you can't hit your target, there is always accuracy through volume.