Amazon offers the UTG AirSplat Airsoft BB Magazine Speedloader.
Love airsoft guns but hate taking the time to reload? Turn to this airsoft magazine speedloader, which makes loading BBs into your airsoft rifle, pistol, or machine gun easier and less time consuming. The speedloader–which weighs 0.5 pounds–is compatible with all types of standard AEG magazines, and also includes an adapter for the most popular gas blowback pistols. Applicable to all types of airsoft guns! Make loading easy and less time consuming. Buy an extra magazine so you can reload faster!