MR 223 A3 adjustable gas block
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Thread: MR 223 A3 adjustable gas block

  1. #1
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    Default MR 223 A3 adjustable gas block

    Hi

    I'm planning to buy an adjustable gas block for my MR 223 A3 16,5" and replace the stock block. Does somebody have any experience replacing the stock gas block?

    First I'd like to know does it make shooting suppressed a bit better than the regular gas block? Problem is that the gun is heavily over gassed with my B&T Rotex V Compact.

    a) Does HK 416 adjustable gas block fit to this gun normally?
    b) Does it work with 16,5" gun?
    c) Do I need any other parts (HK416 Inner Small Parts Gasblock)
    d) Can I use old pins or should I buy new ones?

    I'd be extremely grateful if somebody could share their knowledge.

  2. #2
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    Replacing the gas block is fairly easy.

    An AGR will simply allow control of bolt speed and slow the unlock/extract/eject portion of the cycle to ensure a more reliable cycle and reduce wear and damage on the internal parts of the gun.

    Given the dimensions of the selector in a second generation AGR, it will have some effect on all operating systems, but will work better on some then others. Exactly which ones is as yet to be determined stateside. HK knows.

    With Spring style roll pins, it's suggested to replace rather then re-use.

  3. #3
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    Quote Originally Posted by DukeNukem112 View Post
    Problem is that the gun is heavily over gassed with my B&T Rotex V Compact.
    Thats very odd. I have the same gun and same SD for thousands of rounds with ZERO issues. In fact the French Army, who also uses Rotex V Compact, actually ordered their HK416F without adjustable gas blocks. Why? Because the vented self adjusting A3 block works fine.

    Do you have a faulty gun?
    JNAP94 likes this.

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    I purchased HK ORM Vented 10.4” gas blocks for my 3, 416 10.4” uppers before any of the NOR 416 AGBs were available. @InshallahTech has tuned the barrel gas ports (by boring them) to work with the vented gas blocks. So far my SureFire SOCOM SB2 suppressor runs great on my uppers and the uppers run great without the suppressor attached. The suppressor tightens the groups nicely at 25, 50 and 100yrds and they still shoot well out to 100 without suppression.

    While I’d love to try a real A5 AGB for $h1t$ & Giggles, my limited experience is telling me they aren’t necessary.
    Last edited by RegularGuy461969; 02-13-2018 at 06:19 PM.
    "Just because you're paranoid doesn’t mean they're not after you!"

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    I am trying to replace the gas block on an unvented HK 416. The 10" vented gas blocks are marked as such, but the adjustable gas blocks I have seen on gunbroker do not have any markings distinguishing them. For the adjustable gas blocks, is there any difference between the 10" and the other lengths?

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    Quote Originally Posted by DukeNukem112 View Post
    Problem is that the gun is heavily over gassed with my B&T Rotex V Compact.
    What symptoms did you experience to feel that your gun is overgassed ?

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    Quote Originally Posted by willgaga View Post
    I am trying to replace the gas block on an unvented HK 416. The 10" vented gas blocks are marked as such, but the adjustable gas blocks I have seen on gunbroker do not have any markings distinguishing them. For the adjustable gas blocks, is there any difference between the 10" and the other lengths?
    You are talking about the Norwegian AGBs that have crept up on GB and a few other places?

    I don’t know much to anything on them but I believe a member has one for sale with a HG to match.

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    Quote Originally Posted by Martellus View Post
    What symptoms did you experience to feel that your gun is overgassed ?
    Thank you for asking the correct question.

  10. #9
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    [QUOTE=RegularGuy461969;3173689]You are talking about the Norwegian AGBs that have crept up on GB and a few other places?

    Yes, that is correct. I am a newbie here so can't pm members directly. If the member could pm me directly, I would appreciate it.

    Thanks much,
    will

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