HKParts has HK416 OEM 10.4 vented gas blocks and HK416 A5 "style" extended castle nut
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Thread: HKParts has HK416 OEM 10.4 vented gas blocks and HK416 A5 "style" extended castle nut

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    Default HKParts has HK416 OEM 10.4 vented gas blocks and HK416 A5 "style" extended castle nut

    Just happened to be passing through HKParts and saw that they currently have in stock:

    HK416 10.4 vented gas blocks (noted as HK OEM), which are a bit of a unicorn
    HK416 10 Gas Block

    and HK416 "style" A5 extended castle nuts (presumably not HK OEM)
    HK416 A5 Extended Castle Nut

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    Well damn that was quick.
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    With respect to the vented gas block, I received the one I ordered and it appears to be an OEM part with the expected "10" marked on the side. I compared the size of the vent and it appears identical to my BA and BC date coded 10.4 vented gas blocks, and visibly smaller than the standard vent on the 14.5/16.5. All in all, the vented gas blocks check out.

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    Thanks nsheers. Do you think the vented block will fit on early 10.4 factory 416 barrel with the heavy profile?

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    Nathan - thanks for the head's up. I just ordered one for my older 10.4 upper!
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    Quote Originally Posted by HK23E View Post
    Thanks nsheers. Do you think the vented block will fit on early 10.4 factory 416 barrel with the heavy profile?
    I do, as a matter of logic. (I haven't tried it.)
    In the manuals, the gas blocks for the 10.4 inch barrels have maintained their HK part numbers throughout the transition from heavy to light profile (203587), while the barrels themselves changed (233103 to 233660). Both types of barrels are shown fitting the same gas block part number, so I'd expect a heavy profile barrel to fit these new gas blocks. Nothing about the vent itself changes its fitment to the barrel, it has the same dimensions as far as that is concerned.
    Last edited by nsheers; 02-05-2017 at 05:10 AM.

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    FWIW, I'm using the standard 14.5"+ gas block like the one that comes stock on a Mr556 with the large vent hole on a 10.5" SBR and it's still overgassed with a suppressor and standard NATO ammo.

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    Quote Originally Posted by HK23E View Post
    Thanks nsheers. Do you think the vented block will fit on early 10.4 factory 416 barrel with the heavy profile?

    The dimensions under the gas block for the HK barrels are the same; foreward (M27) and rear (lightweight, MR556) is where they vary.

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    I thought HK lopped off the sling ears when they drill the gas blocks to vent them?
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    Quote Originally Posted by nsheers View Post
    With respect to the vented gas block, I received the one I ordered and it appears to be an OEM part with the expected "10" marked on the side. I compared the size of the vent and it appears identical to my BA and BC date coded 10.4 vented gas blocks, and visibly smaller than the standard vent on the 14.5/16.5. All in all, the vented gas blocks check out.
    Nathan

    {Ok....I'll go ahead and be the dumba$$ in the room......as usual.}

    I thought these were heated and pressed on at the factory??? How difficult is it to replace ....say a standard block on an AI date coded upper with a new vented gas block? Before I start tearing apart my $5K upper.

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