I really like this gun, so I decided to modify it. (irwinner, I hope you don't mind. If you don't want this on the site, I'll remove it).
So, this is a ''double-barrel'' gun, though both wheels fire at the same time.
So why ''mod''? It's not irwinner's gun with things attached or part changed, it's more of a gun inspired by irwinner's, though some of the concepts on the gun came from his gun.
I've 'fixed' the gun, it now works pretty decently with the right bands.
Anyway, it has a true trigger, and can fire up to 16 bands at one time. At the time, though, I have 14, which is pretty close to its maximum.