HK 416 adjustable gas blocks in stock
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    Default HK 416 adjustable gas blocks in stock

    Looks like hk specialist store has 4 adjustable gas blocks in stock for 299$ ea for the 14.5-16”. He had some vented 10.4” gas blocks but sold out.

    https://www.hkspecialiststore.com

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    Quote Originally Posted by Daveyjones789 View Post
    Looks like hk specialist store has 4 adjustable gas blocks in stock for 299$ ea for the 14.5-16”. He had some vented 10.4” gas blocks but sold out.

    https://www.hkspecialiststore.com
    What makes these AGB for 14.5-16" barrels? First I have seen that specified. Anyone know the 2 'port' sizes in these?

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    It’s an HK factory gas block - 416A5 have the adjustable blocks.

    What makes these AGB for 14.5-16" barrels? First I have seen that specified. Anyone know the 2 'port' sizes in these?[/QUOTE]

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    Quote Originally Posted by kbinmt View Post
    Anyone know the 2 'port' sizes in these?
    I got mine about 2 years ago. Lots of info in old posts. 1.4 and 1.6mm with 1mm vent, barrel port should be 1.6mm. Stock MR port is 1.5mm.

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    Quote Originally Posted by tlrgsxr View Post
    I got mine about 2 years ago. Lots of info in old posts. 1.4 and 1.6mm with 1mm vent, barrel port should be 1.6mm. Stock MR port is 1.5mm.
    Thanks, read those. Most talk about using a 10.4" barrel. What makes these specific to 14.5+, or what's the difference for a 10.4

    Apologies if I'm missing it.

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    Quote Originally Posted by Daveyjones789 View Post
    It’s an HK factory gas block - 416A5 have the adjustable blocks.

    What makes these AGB for 14.5-16" barrels? First I have seen that specified. Anyone know the 2 'port' sizes in these?
    [/QUOTE]

    I think the A5 block is a different, newer AGB and 'shrink fitted' onto the barrel. I don't doubt these are factory, just wondering why 14.5+ is specified, and/or ig they can be made to work on 10.4

    Maybe the only piece I'm missing is the 10.4 needs a 1.6mm barrel port to work with these?

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    Quote Originally Posted by kbinmt View Post
    Thanks, read those. Most talk about using a 10.4" barrel. What makes these specific to 14.5+, or what's the difference for a 10.4

    Apologies if I'm missing it.
    @InshallahTech Can you assist with this?
    Last edited by illicit; 04-06-2019 at 01:51 AM.

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    I think the A5 block is a different, newer AGB and 'shrink fitted' onto the barrel. I don't doubt these are factory, just wondering why 14.5+ is specified, and/or ig they can be made to work on 10.4

    Maybe the only piece I'm missing is the 10.4 needs a 1.6mm barrel port to work with these?[/QUOTE]

    My understanding is these were only for the Norwegian guns, which are either 16" or 10.5". I don't believe the valve is any different. I'm using mine for my 10.5" and I had the barrel port opened to 1.6mm.
    illicit likes this.

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    I think the A5 block is a different, newer AGB and 'shrink fitted' onto the barrel. I don't doubt these are factory, just wondering why 14.5+ is specified, and/or ig they can be made to work on 10.4

    Maybe the only piece I'm missing is the 10.4 needs a 1.6mm barrel port to work with these?[/QUOTE]

    Because they were used on long barreled guns, not short ones.

    All barrels will need at least a 1.6mm port to use one of these correctly as one of the settings is 1.6mm. In other words, one wouldn’t want the barrel gas port acting as a choke effectively making the 2 settings 1.4mm and whatever the barrel gas port is.

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    Is the factory gas port opening on the barrel 1.6mm on a factory 10.4” vented upper? If so does this mean this gas block could be used with no modification to the barrel on an upper that’s already vented?

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