Yes, almost all of the armed forces use either paintball or simunitions for training purposes.
You paint Buzz Bee guns the same way you would paint Nerf guns. You can use spraypaint or just regular paint.
Yes, Co2 packs more of a punch than compressed air. They use Co2 for paint ball guns, and regular paint guns. It is also used for some BB or Air Soft guns.
Spyder uses a few different types of metals. They mostly use aluminum in their guns. Though to make it lighter they use a composite plastic that is durable yet light.
yes
You Rent big bottles and fill your tanks from that. Fine out who deliverys to your local pub as they will use the same co2.
muskits
The minimum enlistment age is 17.
So they can protect themselves from the other army. Plus, they don't always use guns.
After you pass the evaluation and complete physical and weapon training.
Cost.
yes, if they did it was the old black powder and ball muskets.
So you can go 10th prestige and shoot cool guns.