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Suppressed R15 Dirty Brass

Discussion in 'NFA Firearms and Accessories' started by jbeltz7, Aug 14, 2011.

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  1. jbeltz7

    jbeltz7 Member

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    Shooting my Gemtech equiped Bushmaster yesterday for the first time I was using brand new 55 grain FMJ Remington/Federal ammo and after being fired the brass was filthy. I have never seen once-fired brass so covered with black powder residue, the outside of the cartridge case was almost the same color as the inside. Is the extra gas blow-back is causing the issue or is this common for the AR or do I possibly have a problem with this rifle? TIA
     
  2. Jason_G

    Jason_G Member

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    Don't own an AR or a suppressor, but I'd say it's normal, and a product of DI. That crap's got to go somewhere. Someone please feel free to correct me if I'm wrong.

    Jason
     
  3. W.E.G.

    W.E.G. Member

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    Normal with my Gemtech/AR

    Face full of gas too.

    I'll venture the gee-whiz piston-driven AR's filthy the brass too.
    95% of the crap coming back in a suppressor gun is coming down the bore - not through the gas tube.
     
  4. Jason_G

    Jason_G Member

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    Yeah, I guess you're right. I guess the only reason I noticed it with ARs and not with other rifles is because, like you said, it's coming back into the shooter's face through the charging handle opening.
     
  5. JustinJ

    JustinJ Member

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    Running a can on my ARs, sig 556 and MSAR causes the same dirty case effect.

    Interestingly I have a USC to UMP conversion with a 16" barrel (for the time being) that does the same thing to .45 brass.
     
  6. Zak Smith

    Zak Smith Moderator Emeritus

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    Fire about 10 rounds, then leave one in the chamber for 10 seconds, then eject it. The unfired cartridge will be filthy from the gas pushed back up the bore.
     
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