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Discussion Starter · #1 · (Edited)
I have a CZ scorpion Evo carbine but when I shoot it the spent shells come out almost black. Getting a lot of smoke in my face as well and a lot of carbon on the bolt face. I'm thinking the chamber may be OS? It is brand new and I shot Speer Lawman, Blazer Brass, and FCC +P all 115 grain 9mm. Any thoughts?
 

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I get the same thing on my CMMG MK9LE 9mm carbine and my Berretta CX4 9mm carbine, blowbacks tend to be a little dirty. Just keep shooting the snot out of it! My CMMG gets right dirty with the slide fire stock.
 
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