Cheap paintballs are very different from expensive paintballs in that the more expensive models are less likely to explode in your gun. In addition, the flight path of an expensive paintball tends to be more accurate.
paintballs
Do you mean a firearm or a paintball gun?
Freezing paintballs make them brittle. And will likely break wen fired, spraying paint all down the barrel of the gun :(
without CO2 or paintballs, you just put the bolt forward. In most guns this is how you de-cock after a day of play, but if you have a regulator, it may store a single shot. If you fire without co2, the gun will not cycle or fire a paintball, it will only go into the barrel. If you fire with no paintballs and co2, you may damage your gun.
No. They will be too large to fit in the gun or be fired out of the barrel.
Hopper or Loader
a gun shell during a war had explode on it
You can buy airsoft paintballs, but they're the size of a small pellet and I've had a hard time finding them. Technically no. There are NO paintballs that work in an airsoft gun. The answer above was partially correct though. They make marker bbs that are basically bbs but they have paint on them.
There are no 45 caliber paintballs. If there were, you still could not use them in a 50 caliber, due to the barrel being larger and that you would have 1 and 1/4 paintballs in the chamber at a time, which would chop every time.
This all depends on the feedneck on the gun. That is, the circular part on top of the gun that connects the hopper to the marker. If it is clamping feedneck, simply release the clamp, push it down all the way and close the clamp appropriately. Others you may have to unscrew with an Alan key, and on the lower guns, just push it on their to the best of your ability. Though clamping feedneck is by far the best to have on a gun, due to the fact that it decreases the possibility of the hopper coming off.
18 is the minimum age for purchasing paintball markers, paintballs, or tanks.