Brass marks near ejection port.

[Craigxo]

Sorry, if this sounds stupid. I have shot many pistols through my life and I recently became a first time HK owner. After shooting 200rds through my USP I noticed all brass marks near the ejection port.
I have never seen this happen with any other pistol I have shot. Is this normal?

 

[AGG]

Welcome to the site.
No stupid questions here--- is the firearm new (?)--- is yours a USP Standard, Elite/Expert, or Tactical (?)(recoil spring lightest to heaviest--- E/E, S, T).
The brass marks are normal, especially if you are using weak ammunition and new recoil springs.
Once the sidearm is broken in, the brass marks should go away.
A copper solvent should remove the brass marks--- research which is the best at removal, and which will not damage the finish.

Tony

 

[Guyanaman1963]

Sorry, if this sounds stupid. I have shot many pistols through my life and I recently became a first time HK owner. After shooting 200rds through my USP I noticed all brass marks near the ejection port.
I have never seen this happen with any other pistol I have shot. Is this normal?

Welcome to the site!!!!
thats some good info above!!!!
M.