Whats that one The Simpsons Episode!?

Where bart and his dad are like in a garage and it shows a scene With Bart Holding a handgun and laughing and then its skips to where hes holding a rifle and laughing and then the weapons get more powerfull suck *** a bazooka and grandes and then someone trys to run and gets shot? I loved that episode as a kid..But i cant remember the name Help? Thanx...