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Discussion Starter #1
Hello, everyone joined here recently. I just purchased my first HK in the last couple weeks. I have put about 300 rounds down the pipe. It is a great shooter in everyway, accurate, no failures of any kind. The question I have is this, I noticed on Fri when I finished shooting that on the inside upper edge of the ejection port there was what appeared to be some wear already or a glint I guess would be a better description. Is this normal? Is there a issue with the extractor and brass not clearing the port as it is ejected from the port? The wear is not bad but I notice it now that I have seen it.
 

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Discussion Starter #3
I have no pictures to post yet. There is no nick it just has wear that looks like brass in color.
 

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That is normal, as the brass glances off the slide in that area. This is metal transfer, meaning the finish is harder than the brass, and the brass is transferring onto the finish. The marks want to be there, so I leave them alone; but they can come off with a little solvent and elbow grease.

BTW, it's not unique to the USP40, all HK's have this. Think of it as the same transfer marks that the deflector gets on the AR platform.
 

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I do not have this on either of my .40s....USPf and USPc....I would suggest some pictures....the description above makes complete sense (brass transfer)...just has not been a common phenomenon for me ( I average 500-1000 rounds per range visit fwiw)

If it comes off with solvent and elbow grease I wouldn't fret....

Apollo11 what's your basis for it being 'normal' you have my curiousity sir....
 

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When brass hits the aft section of the ejection port it leaves marks. The topic gas been raised a few times, it is often posed as a rust question.

My guns all have a few brass marks on this part. My take is that if it is from brass hitting, it's normal and all good.
 

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When brass hits the aft section of the ejection port it leaves marks. The topic gas been raised a few times, it is often posed as a rust question.

My guns all have a few brass marks on this part. My take is that if it is from brass hitting, it's normal and all good.
That makes complete sense...thanks for the clarification...I double-checked mine to no avail....might have something to do with my use of reloads as opposed to factory ammo?
 

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That makes complete sense...thanks for the clarification...I double-checked mine to no avail....might have something to do with my use of reloads as opposed to factory ammo?
Could be. I also roll my own, and I get it on my guns. I think the variable is slide speed as it translates to the casing hitting the ejector. Too many variables for me to intelligently quantify why there is a difference. The good thing for everyone is that there is no harm in the marks, and they are apart of the operation of some pistols/rounds.
 

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I always rub down the slide with a VERY light coat of remoil when I clean mine. I wonder if this is why mine does not show any brass transfer? I typically put 200+ through it at least twice a month, sometimes more.
I don't reload so all of mine is factory ammo.
 

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another one of those things that it is good to know is normal--if it appears i will not fret! Thanks for the info!
 

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Discussion Starter #11
That makes since. Thanks I remember it was on my Sig early also and it did come off with a little work. I have not been able to clean mine well yet. I have only been able to shoot it at the range. Waiting to pick it up Friday a from dros.

I will give it a good cleaning after I pick it up. Thanks all!
 

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Discussion Starter #12
Well a little update. I got the gun home yesterday from the mandatory 10 day wait here in Ca. I cleaned her nice and that spot is not a issue. I think it was brass transfer as someone mentioned, it came off during the cleaning. Thanks for all the help.
 
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