NRA4EVER - the cash register in the opening credits when Maggie is scanned.
Five days is not too long to have to wait for a gun. - Bart's blackboard lines in one of the opening credits.
Homer: But I don't want to wait five days; I'm mad now.
Homer: I don't have to be careful. I got a gun.
Homer: Lisa, if I didn't have this gun, the king of England could walk right in here and start pushing you around.
Krusty the Clown (or was it Moe?): Guns aren't toys. They're for family protection, hunting dangerous or delicious animals, and keeping the King of England out of your face.