Quoted: did not see ANY THING WRONG WITH THE GUN BUT NEET TO CHECK THE HEAD SPACE .
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You need to call Glock. I would not let anyone else fiddle with the pistol. Yes, take pics for us.
How old is your pistol? Is it stock? Are you ceratin of the type of ammo you were firing?
I would be more inclined to believe there was a case failure (i.e. overcharge/double charge, weak brass) as opposed to a headspace issue with the pistol. A couple other things which could cause what you have described is bullet setback (not common on the .40), an obstruction in the bore, a stuck firing pin possibly igniting the primer before the pistol was fully in battery (less likely).
The .40 cartridge headspaces off the case mouth and it is not as critical as say the headspace on a bolt action rifle. There is a little leeway there and I dont believe your pistol left the factory with a defective chamber resulting in excessive headspace.
We could speculate all day.... Call Glock