I agree that it would be stupid to have that in a paintball game but it would still be cool to shoot. The 8 registered real minguns in the US that are available to citizens wieght 271 pounds unloaded.
If you tried to shoot one of those while holding it, it would spin you around. unfortunately , the real ones cost $300,000 (US) and up +
ammo. plus they are not legal in all states but for good reason.