500 BBs
Compared to your standard 100 BBs speedloader. You won't have to refill as often and you will save time during game breaks to reload. Less hassle, more game time.
M4 MAG SIZE
It's shaped in the same way as your standard M4 mags. Therefore you can store it in any M4/AR15 type mag pouch. The best way to carry your speedloader securely.