Cartridge speedloader is a very interesting alternative for standard syringes. This one utilizes rotation, the device is powered by a crank. In contrast to standard syringes, the cartridge can store up to around 1000 BBs and once you get used to the new way of loading magazine, a standard Mid-Cap magazine can be loading within 4-5 seconds.
Thanks to the implementation of a standard M4 magazine socket, the speedloader is compatible with majority of magazines of this type. The magazines attached to the speedloader fit there in a stable way and their filling, even in difficult condition on the battlefield, will not be a problem. The entirety is made from a durable polymer. The size of the speedloader allows for its carrying in a double pouch for M4 magazines.