The barrel is just a tube, there is nothing "in" it. If you are asking what it is made out of, most of them are aluminum, there are a few ceramic and carbon fiber ones as well though.
cleans the barrel
no, because the air is what pushes the paintball out off the barrel.
Any autococker threaded barrel.
All paint ball guns with a regular barrel will shoot around 300 feet. there also is no specific "ak 47" paintball gun
you need Co2 to fire any paintball gun, it is what physically moves the ball out of the barrel.
AIM B Style Red Dot Gun Sight-wrong your barrel
Yes, it is what physically moves the ball out of the barrel.
It shoots semi automatic and has a removable feedneck and barrel.
All paintball guns, excluding high end guns, have a .685 bored barrel.
On a paintball gun C02, or High pressure air is necessary. It is compressed air that, when the trigger is pulled and the marker fires, propels the paintball out of the barrel.
No paintball gun will work without a CO2 tank or other propellant tank. without Co2 there is nothing to push the ball out of the barrel.
You must get a Spyder threaded one for it to fit.