Just bought a new USP 45f and looking at the cases after firing the primer has a keyhole shape on the primer where the firing pin hits. Is this normal? I have less than 20 rounds through this gun. I know that when this happens on a 1911 the barrel is unlocking early and the firing pin is run across the primer while the barrel is unlocking. Is this the same for Usp 45f? If so how do you fix it? I really like the gun and if it is something I can do to fix it with out shipping it in I would rather do that. Thanks for any replies.

Commonly seen in both the USP and the Sig 220's. It does not necessarily indicate early unlocking as such, but rather the fact that the firing pin is dragged down the primer face as the barrel / slide come back and down as a unit. The swinging link of the 1911 does not allow as much tolerance for this as does the set up with the Sig and USP.

Shoot it, this is not a problem unless it continues to get worse...which I don't think it will.

The proof case that came with the gun has the same markings.  If this is normal I will just shoot it and keep an eye on it.  It fuctions fine. Shoots great.

Quoted: It fuctions fine. Shoots great.

Then hellfire boy, shoot the shit out of it!!!!!! Nothing wrong with that gun.