Gun Jammed up Today - how concerned should I be

[fabsroman]

I was out shooting my HK USP Compact 9mm today. Something that I don't do much of, but I have probably put a couple thousand rounds through the gun over the last couple of years.

Today, for the first time, the gun jammed, and it didn't do it just once, but 5 times.

The first four times were on the 10th round (i.e., last round) out of the clip. The last time was on the first round out of the clip.

It wasn't a feeding problem, but an ejection problem. The spent case was getting caught in the action. Essentially, the base of the case was caught in the action trying to close.

I was using ammo that I have never used before because this range requires that we purchase our ammo there. I was using some Fiocchi rounds today that had a red sealer on the primer. When I got the gun home today, I checked it out and this red primer sealer is all over the firing pin area.