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First, I'm a bit new to firearms in general. This is my first gun and I've had it for a few months, no issues yet. Fired Blazer, Federal, Remington through this gun with no issue at all.

Just got back from the range and began cleaning my USPc 9mm. Shot about 225 rounds of Winchester White box 115gr FMJ with no operational issues. Pulled the slide off, and there was some brass-looking fragments all over the inside. I noticed little casing or bullet frags all over the inside of the mag well, detent, trigger assembly, hammer, etc. basically everywhere. What can cause this?



The only thing I've done different is the WWB ammo (and shoot decent groups haha!). Has anyone else seen this? Dirty ammo? Extractor? Should I tear it completely down and clean all of it out? Overreacting? Thanks for the help guys!

PS. Held a P7 at the range. A little rough for the asking price, but definitely the next investment.
 

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I've had that weird yellow earwax kinda stuff from ammo before. Mainly Prvi Partizan. Never from any other brand.

I decided to sell off my remaining few hundred rounds of PP. I didn't know what it was, or any ramifications it had, so I didn't care to keep it around. Nor do I want to excessively gunk up my piece with anything if cleaner ammo can be had.
 
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