The Max Reloader is a 1,000rd airsoft BB speed loader that works with most M4 mid-cap and low-cap airsoft magazines. This airsoft speed loader comes with a hideaway crank, and allows for ultra fast loading. Their compact size allows the BB loader to fit in a standard double stack M4/M16 magazine pouch. The Max Reloader also has an anti-jamming, overflow clutch, which prevents overloading. We recommend our Valken SMAG 140rd Mid-Cap airsoft magazines for use with this speed loader.