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Thread: 5.45 S&W over gassed?

  1. #1
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    5.45 S&W over gassed?

    I have a ton of 5.45x39 ammo.

    I have a S&W 5.45x39 S&W upper.

    Every time I fire it puts a gas of jet into my eye as bad as if I was shooting suppressed, even though it is not suppressed.

    It seems like it is grossly over gassed.

    Given teh huge amount of 5.45 ammo I have, I am committed to making this work.

    Has anyone else had issues with 5.45x39 S&W uppers being over gassed?

    IF this really is the problem, then an adjustable gas block should be an easy solution.

    TED

  2. #2
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    Not a surprising situation.

    Dialing the gas down should correct it.
    Black River Tactical
    BRT OPTIMUM Barrels - 16" EXT, 11.5" CAR, 9" PDW
    BRT OPTIMUM-S Barrel - 11.5" CAR Suppressor
    BRT Covert Comps 7.62 + 5.56 + 6X + 9mm
    BRT MarkBlue Gas Tubes - BRT EXT and PDW Lengths
    BRT EZTUNE Gas Tubes - CAR and MID
    BRT MicroPin Gas Blocks .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  3. #3
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    Quote Originally Posted by Clint View Post
    Not a surprising situation.

    Dialing the gas down should correct it.
    I think so. I sure hope so anyways!!

    Also, BTW, I get a higher number of malfs, failure to feed, and double feeds in my S&W 5.45x39 AR than I do in my MSAR 5.45x39!!

    Yep, I have one of the 12 to 20 factory guns, and yep I shoot it although only rarely because of the pain of cleaning corrosive ammo, the AR has NP3 so no worries.

    TED

  4. #4
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    Ive had zero problems with my 5.45x39 S&W running a H2 + springco blue and A5H2 + vltor rifle spring in ~12k rounds.
    Last edited by vicious_cb; 09-24-18 at 21:48.

  5. #5
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    Quote Originally Posted by TED View Post
    I think so. I sure hope so anyways!!

    Also, BTW, I get a higher number of malfs, failure to feed, and double feeds in my S&W 5.45x39 AR than I do in my MSAR 5.45x39!!

    Yep, I have one of the 12 to 20 factory guns, and yep I shoot it although only rarely because of the pain of cleaning corrosive ammo, the AR has NP3 so no worries.

    TED
    Sounds like you have bad mags.

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    Quote Originally Posted by vicious_cb View Post
    Sounds like you have bad mags.
    It's the SAME mags in both guns.

    I have one of the 12 to 20 MSAR rifles in 5.45x39.

    TED

  7. #7
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    Quote Originally Posted by TED View Post
    It's the SAME mags in both guns.

    I have one of the 12 to 20 MSAR rifles in 5.45x39.

    TED
    Then I dont know what the issue is, me and several members have killed barrels on these 5.45 uppers with little to no trouble. From personal experience they are gassed as much as a Colt 6920 since Ive shot them back to back on the same lower. What buffer are you using?

  8. #8
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    I had the same issue and solved it with an adjustable gas block, I was sprayed with gas for the first couple shots and then dialed down the gas input since the block was already present on my build.

  9. #9
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    Quote Originally Posted by TED View Post
    , and yep I shoot it although only rarely because of the pain of cleaning corrosive ammo,
    Try Ballistol (straight and water mixed) for that. Haven't shot much chlorate primed ammo in awhile, but the stuff makes cleaning Pyrodex fouling a breeze now that I switched to it. Dissolves any type of projectile jacket fouling I can think of also.

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