Well im picking one of these up in a group order. I know there many more realistic but i really like the way this on looks and functions. But different sites say it takes different shells. On evike, they it takes everything but king arms and craft. On redwolf it says it wont fit POM Type, Madbull M922A1, Stinger Gas Grenade Cartridge, GB Tech, S Thunder or Ares grenades. But on panda airsoft it says it fits all shells. This has left me scratching my head. I did want to get 4 or 6 bb throwing shells. And the what super dooper high powered shell to make a tube launcher for Nerf launchers. I'm here to ask if any one can tell me the difference in the shells listed in not being compatible.