Gee Bob, I wish I would've been online so that you wouldn't have lost sleep over the firing pin sticking out of the breech face! That's normal.

If the pistol was not cocked, and then the slide was racked to slide lock, the firing pin protruded. However, if the pistol was cocked, and the slide was racked to slide lock, the firing pin did not protrude.

Yep. Exactly as it should.

Remember, most pistols have a firing pin spring that holds the firing pin away from the breech face. The Glock has no mainspring, so as a striker-fired pistol the firing pin spring forces the striker towards the breech face.

So when the Glock is "not cocked" (actually the condition is never "cocked" unless you are pulling the trigger), what is actually happening is that the firing pin safety is defeated because the trigger is to the rear. An extention of the trigger bar is what defeats the firing pin safety when the trigger moves rearward.

When your trigger resets forward (and the gun is 15% "cocked"), the trigger bar is out of the way and the firing pin safety spring pushes the FPS plunger back into battery, blocking the firing pin from forward movement.

The proper way to test your Glock for firing pin safety function is to remove the slide from the pistol. If the firing in is protruding from the breech face, pull the tail of the striker rearward. You should hear a click - release the firing pin back forward, and it should not protrude. Place a little rearward pressure (if necessary) on the firing pin tail and push the firing pin safety plunger into the slide - the firing pin should now be able to pop out through the breech face. The safety works as intended.

BTW, something I haven't mentioned before is how you store your Glock pistols. In any Glock that has the standard trigger (coil) spring, you should probably store the gun (WHEN EMPTY) with the trigger rearward. Guns that have a New York (leaf/coil) style trigger spring should be stored trigger forward ("cocked").

The standard style spring (3.5 and 5 pound models) actually helps pull your trigger - IOW, it is pulled to extension when the trigger is forward, and relaxed when the trigger is rearward.

The NY type trigger spring (8 and 12 pound) resists trigger pull, and is at rest when the trigger is foreward, and compressed when the trigger is rearward. FWIW.