Knifebomber,
I have read that WD-40 is dangerous to use on firearms. Their has been documented cases were law enforcement officers have gotten killed due to the WD-40 making their ammo usless! From what I remember, WD-40 is a super penitraiting lube, and if its near the ammo, it can work its way into the primers. If this happens the primer may not work. The case that was shown to us in my Police Acadamy was were a police officer that cleaned his duty revolver with WD-40, and walked into the middle of a armed robbery. He was shot, and when they checked his weapon, all six rounds in the pistol had hammer struck primers and none fired. Just trying to give you a heads up, incase you did not know. Modern ammo is sealed well, but one misfire at the wrong moment may mean the difference between life and death.
Thanks, Reagan