HKParts has HK416 OEM 10.4 vented gas blocks and HK416 A5 "style" extended castle nut - Page 2
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Thread: HKParts has HK416 OEM 10.4 vented gas blocks and HK416 A5 "style" extended castle nut

  1. #11
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    Those of you who have ordered one- can you post photos of what you received? HKParts uses the old 10.4" non-vented block for both product's photos.

    Thanks.
    [Insert Witty Comment Here]

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    Brad, that was my question as well. However, after some research, the A5 block with the adjustable gas regulator is the gas block that is press fit and shrunk on the barrel. Every photograph I have found of the vented 10.4" gas block shows that it is pinned with the two roll pins like the earlier non-vented gas blocks. So unless there is some change in the internal dimensions of the gas block, the new style should fit on the barrel. When I get my block, I will post photographs compared to my old non-vented block as well as installed on one of my 10.4" heavy profile barrels. Fingers crossed!

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    Quote Originally Posted by HK23E View Post
    Brad, that was my question as well. However, after some research, the A5 block with the adjustable gas regulator is the gas block that is press fit and shrunk on the barrel. Every photograph I have found of the vented 10.4" gas block shows that it is pinned with the two roll pins like the earlier non-vented gas blocks. So unless there is some change in the internal dimensions of the gas block, the new style should fit on the barrel. When I get my block, I will post photographs compared to my old non-vented block as well as installed on one of my 10.4" heavy profile barrels. Fingers crossed!
    HK23E:

    PLEASE DO!!!! Can you send me before and after pics? I'd love to know how that whole process plays out. I've got some beater 10.4" uppers, and I've got some that have never been fired....so I'd like to get it right on the beater, before I enter into the pristine collection. Thanks again.
    A redneck's famous last words...."Hey everybody, watch this!"

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  5. #14
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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.


    So you eyeballed thousandths of an inch? Or did you have a set of pin gauges on hand and measure it?

  6. #15
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    Quote Originally Posted by HK23E View Post
    Brad, that was my question as well. However, after some research, the A5 block with the adjustable gas regulator is the gas block that is press fit and shrunk on the barrel. Every photograph I have found of the vented 10.4" gas block shows that it is pinned with the two roll pins like the earlier non-vented gas blocks. So unless there is some change in the internal dimensions of the gas block, the new style should fit on the barrel. When I get my block, I will post photographs compared to my old non-vented block as well as installed on one of my 10.4" heavy profile barrels. Fingers crossed!
    Check the A3 barrels? There was never an HK part number for the Vented gas blocks. They were special order for certain Agencies and Units.

    Not saying they couldn't have changed things, just curious to know facts.

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    Jason, right now that is all I can do until I get the vented gas block in my hands. I decided it worth it to take flyer and pick one up and try it.

  8. #17
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    Quote Originally Posted by HK23E View Post
    Jason, right now that is all I can do until I get the vented gas block in my hands. I decided it worth it to take flyer and pick one up and try it.
    Not ment to be taken negatively towards you personally!! I am interested in seeing it as well, and having someone pin gauging the vent hole?

  9. #18
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    Below is a link to one of members who has both vented and non-vented gas blocks on 10.4" uppers that he updated with photographs.

    https://www.hkpro.com/forum/hk416-hk4...ck-pics-5.html

    Personally, I have never handled one of the vented gas blocks, much less removed them from a barrel.

    I have however, removed the non-vented gas block a 10.4" heavy barrel. I have also handled an A5 at shot show when they were first introduced and the photograph uploaded by James shows the difference in how is it retained.

    https://www.hkpro.com/forum/teufelshu...er-course.html

    As I posted, I believe the vented block will work. However, there is only way to way to know and this is try it. I am keeping my fingers crossed there is not some internal dimension differences that I can't see including gas port size on the barrel itself which frankly has been debated over and over.

  10. #19
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    In the first link, Drooler pin gauged the vent holes on his gas blocks. If someone wants to loan me a set of the pin gauges, I am happy to do so with my barrel port and the vent hole on the gas block.

  11. #20
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    As I noted above, I visually compared the vent holes. It was fairly easy to see the difference between the two sizes side-by-side, especially using light. The 14/1000s of an inch difference is pretty noticeable when it makes up approximately a third of the total size. I also was able to slide a 0.050 wrench, my smallest one, down the full size 16.5 vent hole, but I was not able to get any of it into the 10.4 vent hole, either on the new HKParts gas block, or on my vented BA and BC 10.4 inch uppers. I don't have pin gauges to measure the holes precisely, but the new vented gas block looks just like the ones on my BA and BC uppers, and has a vent hole approximately the same size, and certainly smaller than the full size vent. Since we know somebody commissioned the specially vented 10.4 inch gas blocks with smaller holes (and I was involved in the discussion referenced above from a couple of years ago), that information was enough for me to conclude it was worth a try to switch the gas blocks out, but to each his own.

    As for the A5 gas blocks, they are indeed the ones that are shrunk onto the barrel as an integral unit. They no longer have a separate part number as someone noted above, just the gas nozzle and regulator parts do, but I don't know anyone who sells them. Maybe in Canada? I'm also not aware of the vented 10.4 inch gas blocks having a unique part number either.

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