The Odin Innovations M4 BB Speed Loader in Red (very limited edition!). A great speedloader model, the M12 Sidewinder is perfect for airsoft M4 midcap and lowcap magazines. Compatible with all types. Insert your M4 magazine into the 'mag well' of the speed loader and it locks into place (like your gun). Wind the wheel quickly to load your magazine up 100%. Effortless and simple! Simply press the mag release to drop your mag out. Speed Loader fits into standard M4 double magazine pouches for field carry. A must have for milsim events where you are required to use midcaps. Will not work on hicap magazines. The construction and feel is pretty solid.