Any of the Tippmann/BT4 guns have the most aftermarket parts. not only barrels, internals and electronics, but outer grips, shrouds and other aesthetic parts.
Most local paintball dealers will have the parts as well as the expertise to customize repair and upgrade paintball markers. They will usually show you how to do the customization yourself of they will do it for you for a price. You can buy customized markers online from some manufacturer sites or from resale sites such as eBay.
Canadian Tire has the best deal on paintball gun packages. One can also get best deal from paintball online store. Amazon has Tippmann 98 package for $154.
eBay is the best way to sell
Unless you mean a simple potato gun, then not really. Designing a paintball gun from the ground up would take extensive machining and airsmith knowledge. Most people modify or customize existing parts for their guns, or machine noncritical parts for safety reasons.
The purpose of a paintball gun is to fire paintball pellets, to mark opponents in the game of paintball.
A paintball marker is a paintball gun. It is just called a marker instead of a gun.
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No. The state of Ohio did not invent the paintball gun.
No, do not expose your paintball gun to water.
A paintball gun is several magnitudes stronger then a Nerf gun. A paintball travels at around 200 mph, where a Nerf gun is around 10.
11 to play at fields, 18 to buy a paintball gun.