It depends on how frequently you use your gun and how often you maintain it. The material and the build quality are also factors affecting the lifespan of a gun. Most paintball guns usually last for a good 5-6 years. Casually speaking, there is no point in using a gun that is more than half a decade old, so it is more than enough time. They do wear and tear like every other thing. However, if you maintain your gun timely, it will last pretty long.