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Thread: 2014 Shot Show: HK 556A1 SD, OSS suppressor and HK keymod rail

  1. #1
    Administrator greentips's Avatar
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    2014 Shot Show: HK 556A1 SD, OSS suppressor and HK keymod rail

    We got to shoot the new HK556SD in the media day. We were very impressed by the OSS suppressor. With the BPR ( back pressure regulator) and SRM ( signature reduction module), the MR556 SD shot like a .22 rim fire. There was almost no recoil and muzzle flip, in addition to sound suppression.




    The most significant feature of the OSS is that the “core” of the suppressor is permanently attached to the barrel. The only registered suppressor is the outer cylinder. In addition, the wear part of the entire suppressor is a 40 dollars detachable gas bleeder at the muzzle, which will last 10,000 rounds and could be changed by simply unscrewing off the muzzle.







    Most suppressors are internally arranged as a series of expansion chambers linked up in linear fashion. The OSS works in a reverse manner. Gas is bled off into the expansion chamber between the inner and outer cores at the end, and flow in the opposite direction to the bullet travel. The chamber between the inner and outer cores is partitioned by a series of fins spiraling around the inner core.




    For those who cannot own suppressor, OSS also has a flash suppressing compensator, which has a similar geometry as the gas bleeder in the suppressor. During my test fire, I found that it is extremely effective in reducing muzzle flip. I asked the OSS staff if obstruction by mud would create a barrel explosion due to the exposed complex geometry , he reassured me that the muzzle would just blow the debris out without creating an obstruction.




    Finally, according to HK staff, the keymod rail will be available for purchase. With the keymod rail installed, he estimated that the weight of the MR556 will be brought down to under 8lb (instead of 8.4lb)
    Last edited by greentips; 01-12-2015 at 12:15 PM.


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  2. #2
    CGN Regular 1leggeddog's Avatar
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    For those who cannot own suppressor
    hmm... almost everyone on this forum unfortunately.

    These keymod things seems to be pretty popular as of late. Are poeple FINALLY tired of having 10 feet of picatinny rails on their rifles?

  3. #3
    CGN Regular garybusey's Avatar
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    They let you take these pictures on media day? for CGN?

  4. #4
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    I'm all over those OSS Bannar brakes! Can't wait for one for my Adcor.

  5. #5
    CGN Ultra frequent flyer Stevebot-7's Avatar
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    Quote Originally Posted by 1leggeddog View Post
    hmm... almost everyone on this forum unfortunately.

    These keymod things seems to be pretty popular as of late. Are poeple FINALLY tired of having 10 feet of picatinny rails on their rifles?
    They're handy, and a bit less aggressive on the hands than rails. It would be nice to get a side by side comparison with my NSR.

    That compensator is enticing!
    Death comes by subtle means; the satisfaction of routine.
    Lifetime member of CSSA and NFA.

  6. #6
    CGN Regular xURSOx's Avatar
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    Awesome bunch of kit, too bad suppressed is prohibited here. makes me sad.
    CCFR Member - Rifles and Reels shooting club - Sudbury Ontario

  7. #7
    CGN Regular C23's Avatar
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    Quote Originally Posted by xURSOx View Post
    Awesome bunch of kit, too bad suppressed is prohibited here. makes me sad.
    x2....

  8. #8
    BANNED
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    Looks like an engineer though it would be a good idea to tap a whole through a carbide drilling bit and voila!

    And I say this because I think it's looks awesome!

    Will be interesting to see which part(s) we'll be able to own in Canada..?

  9. #9
    CGN Regular Mikeschurman's Avatar
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    Quit teasing us with stuff we will never own in canada
    Insert list of guns you own here:
    (Who needs a registry if everyone advertises what they own)

    Scrap Bill C-68

  10. #10
    CGN frequent flyer charlesquik's Avatar
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    Quote Originally Posted by Mikeschurman View Post
    Quit teasing us with stuff we will never own in canada
    was thinking the same im drooling over that supressor

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