Speedloader M15/M4 Hi Cap with a capacity of 400 BB’s. Convenient and useful, this high-capacity speedloader is similar to an M4/M15 magazine and fits perfectly in a magazine pouch or pocket. A sliding lid opens for easy filling, fits the opening of any AEG magazine, and a spring allows for quick replenishment. The transparent design lets you see how many BBs are left. The plunger can be locked down for storage. Includes an adapter for filling pistol magazines.