HK416/MR556 10.4” Barrel/Gas Block Configurations that Worked - Page 2
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Thread: HK416/MR556 10.4” Barrel/Gas Block Configurations that Worked

  1. #11
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    The best type of gas configuration will allow full function to include locking the bolt back on the last round of the magazine with ejection pattern being just around 4 o'clock. This will ensure that suppressed shooting has a wider range of bolt speeds without getting into serious "over gas" bolt speeds.

    This way it really doesn't matter what kind of a suppressor is used as even older legacy cans won't add enough gas to adversely affect operation and newer cans or cans with little added pressure duration will be a wash.

  2. #12
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    Information updated by @RegularGuy461969 .

    -10.4-gas-block-info.jpg

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    I’m working on putting together an upper based on a Brownells barrel and vented gas block. I’m thinking that the 1.6mm port will give me the best results but I’m curious if anyone else has any insight.

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    Quote Originally Posted by gunsnmammons View Post
    I’m working on putting together an upper based on a Brownells barrel and vented gas block. I’m thinking that the 1.6mm port will give me the best results but I’m curious if anyone else has any insight.
    Depends on the vent in the gas block whether its made for the 10" or 14.5-16" barrel.

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    Quote Originally Posted by LEEF View Post
    Depends on the vent in the gas block whether its made for the 10" or 14.5-16" barrel.
    I purchased one from Marvin Pitts. It has a 1mm vent it was made for the 10"

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    Quote Originally Posted by gunsnmammons View Post
    I purchased one from Marvin Pitts. It has a 1mm vent it was made for the 10"
    Then you should be good to go!

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    Hey, do you have contact info for Marvin Pitts? I want to follow your lead here.

    Thanks

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    Quote Originally Posted by austin.breakfield View Post
    Hey, do you have contact info for Marvin Pitts? I want to follow your lead here.

    Thanks
    https://www.hkpro.com/forum/nefarious-arms/

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    Just ran Marvin's vented 0.035" gas block on a 10.4" MR555 barrel (1.37mm gas port) with stock HK buffer/spring and M193 ammo.

    Bolt locked back on last round unsuppressed with a nice, tamer recoil (than a non vented block) and 4:00 o'clock ejection. Bolt locked back on last round using a suppressor, with a 2:00 o'clock ejection, and bolt coming back a little more smooth compared to non-vented block, but still violent in my opinion.

    Unsuppressed, this thing shoots nice with very nice ejection. Suppressed is still not my favorite gun to shoot with a silencer, but getting there. HK got it right with the 1.6mm gas port and 1.0mm vent.

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    Could someone give me some advice on the following? I have the vented GB that came with my 416 build kit from the brownells. I am in the process of building a 10.4 in. Nefarious Arms barrel version of the HK with this kit. Question....Will this VGB work with the 10.4 in barrel configuration? Thank you in advance for your time.

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