Speedsofters can check the Monk Customs M-Adapter For TM Hi-Capa Gas Blowback Pistol which allows them to use an M4 magazine in a  more ergonomic way... "Monk Customs keep changing the game bit by bit. The Monk M-Adapter is Monk’s version of a Hi-Capa M4 Adapter  which perfectly fits the SpeedQB game. Runners, forwards, those who need the flexibility and speed to up their game.

• Ambidextrous operation
• One-handed operation for fast reloading
• Compact package enabling the magazine to be flush with your arm
• Designed for sliding and snap shooting over bunkers
• Spring actuated magazine ejection system
• Magwell
• Modular release button
• Ergonomic
• Designed for Tokyo Marui Hi-Capa Mags"