A paintball gun generally comprising a body split into an upper portion and a lower portion is provided. The split body allows exposure of internal components for access, service and/or maintenance. In an embodiment, the paintball gun preferably includes a valve assembly fixedly secured within the body. In an embodiment, the paintball gun preferably includes a barrel adapter for engaging a barrel, with the barrel adapter secured within the body by a gripping piece. A method of servicing a paintball gun is also provided.