Bullgear 2500 Round Box Magazine Kit for A&K M249 Airsoft AEG Machine Gun (Color: Black)

"I purchased this from the bullgear website. It has changed the game in the A&K style m249. It takes some tech experience, but the outcome is worth any toiling in the gearbox. It has a variable feed adjustment (but why wouldn't you want it to feed as fast as possible). The battery remains in the magazine, meaning with a change of the mag (the most unique part of this product), you get a fresh magazine. Holds more than 2500 if you load it correctly. The feeding motor is very strong and its driven by a metal cog. Only downsides are: Requires gearbox work, soldiering work and fine tune fitment). It is best pared with a bullgear hopup (get the newest version).