i suppose all of ya guys already know this by know but anyway this is the only gun u can kill george with the only thing is that he comes back anywayz after that...
It's not the only gun to 'kill' George with. Pack-a-punched, if you shoot George while he is in water, he will disappear for about a round, and respawn with full health, if damaged. You can use any normal gun to kill George, though it is recommended to have ray-guns, scavengers (and their upgraded counterparts), and the sickle (with upgraded ballistic knife is even better). My personal recommendation is the sickle option. It takes only a bit longer than using a gun (even scavenger), and it doesn't waste any precious ammo.
The VR-11, when shot at a team-mate, makes them invincible for about 15 seconds. Pack-a-punched, also gives them insta-kill and zombie-vision for 15 seconds. It is by far NOT a worthless gun.