A short video posted by Airsoftjunkiez on their Facebook page showing an Airsoftjunkiez TCU being connected to a Bullgear box magazine... "Connecting a BullGear box mag to an Airsoftjunkiez TCU. Simple process that will give you trigger control of your Box mag using PolarStar or Wolverine Airsoft FCUs."

Bringing a Heckler & Koch MG4 to the airsoft field is a lot of firepower, provided that it comes with a box magazine. Airsoft Atlanta got the Elite Force HK MG4 Box Magazine and it has a 4,000-BB round capacity... "The HK MG4 Box Magazine is a direct replacement or spare 4000rd box magazine for the Elite Force HK MG4 AEG LMG.

Made by Elite Force/VFC."

Mach Sakai tests the S&T M249 Para Light AEG, which is also known as the Sportline model using the A&K M240 AEG Box Magazine if it is compatible with it. This is a lighweight M249 AEG as it uses polymer as material and comes with the para stock and integrate bipod.

The Bullgear KIT Box Magazine which is 2,500-rd box magazine for M249 AEGs is available at Airsoftjunkiez. This has been designed for fast box magazine change and with its wiring design there is no wires outside of the box that need to disconnected... "Airsoftjunkiez custom Bullgear Box mag & wiring kits are available now."

A 5,000 round box magazine for the M4! Well, that's a lot of BBs to go around with this Laylax First Factory Dual Function Box Magazine. Made for the New Generation and Standard Tokyo Marui M4 AEGs (New Gen will need the adapter that comes with it), it's main compartment can carry 3,000 rounds and a sub-compartment that can contain 2,000 BBs. It can be winded up via a knob at the back or the regular windup at the bottom. No need for batteries.

Video from Laylax showing the Krytac M4 Box Magazine. They say that this electric-powered 4,000 round box magazine is top-level class and when the switch is pressed, will feed the 4,000 rounds continuously, making a reliable box magazine. This is the same box magazine also seen the Krytac LMG Enhanced.

Helpful article written by Airsoft Outlet Northwest to help you deal with airsoft M249 box magazines... "Sadly, it doesn't matter if you own a CA or an A&K box mag, they all have their own problems eventually. Today we will be focusing on the Gen II CA M249 Box mag and how to overcome its shortcomings.