He has two fingers on it because it is a semi automatic gun that is made for you to use two fingers. You can shoot a lot faster. In tournament play you can't use burst, or full auto. It's either semi or a mode called Ramping. I tried air soft and I didn't like. I didn't think it was as much fun as speed ball, but it is personal preference.

Hmm... Never seen such a weapon. (Airsoft, I do it because it's cheaper, and the guns are substantially more realistic.)

No shirt, though? Doing a match without a shirt isn't high on my list, unless we're fighting with guns that won't hurt at point-blank (really low-velocity).

Yea, I play tournements so you need a gun that is electronic. The tournements I play you can legally have your gun at 15 balls per second but a lot of people will set it at 16.
Yea, not very often will I play without a shirt because you get some of the nastiest welts that way. I really don't think it hurts, but if you go swimming people will ask you if you have ring worm and you just tell them it's paint ball. I think it's funny. No we don't turn the velocity down we leave it at 300 FPS. Yes it sucks to get bunkered shirtless. :)

Electronic? I think you mean electric...

I wear a shirt, we have 330-FPS pump rifles and 260-FPS AEGs so you don't want to be caught without.

Sorry it took me so long to get back to you, but any ways...
I mean electronic, it has basically a mini computer in the grip. When you pull the trigger it hits a micro switch witch then sends the signal to the motherboard then to the solenoid, which then fires the gun, by letting air into the gun. It's really complicated and I hope I said that right. Then you can change a bunch of settings with the buttons on the gun. Like how fast it shoots, turn the eyes on or off, change the amount of air let into the gun, etc...
I would probably try to play air soft at least once with my shirt off to see how bad it really hurts. All the times I've played with my friends it doesn't feel any worse than a rubber band, but thats just me. I also have a very high pain tolerance though.