Looking down the chamber after removing the mag helps.
Gunnery Sergeant Hartman: How many counts in that movement you just
executed?
Private Gomer Pyle: Sir, 4 counts, sir!
Gunnery Sergeant Hartman: Whats the idea of looking down in the
chamber?
Private Gomer Pyle: Sir, that is to guarantee that the private is not
giving the inspecting officer a loaded weapon, sir!
I rack the slide three times, look down the chamber, look in the magazine well, then let the hammer down easy.
Not very John Wayne, I guess.