Why is that so cool? Well with a 13 ci tank, an A5 hopper and a short barrel, you can have one of the most compact set-ups available, while still having lots of firepower. Or even on a 12 gram CO2 cartridge, you could get through most of a short Tac Cap. Leave it to Flasc to come out with inventive solutions and products that others haven't thought of. You can check out their website here.