HK 10.4" Barrels are not 10.4" long - Page 2
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Thread: HK 10.4" Barrels are not 10.4" long

  1. #11
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    Quote Originally Posted by Om3ga9000 View Post
    So if I wanted to cut down an MR556 to 10.4'' specs what difference is there if you are installing a 10" vented gas block to non-vented?
    You will need to tune your barrel gas vent/port to work with any vented gas block. The 16” Port I believe is bigger than the 10.4”. My 10.4” barrels mostly needed to have the barrel port increased in size to work with 10.4” vented gas blocks. If you use a non vented block than you are good. You can use a 14.5” /16” gasblock and have the barrel vent tuned as well; it’s needed because the decrease in barrel length and I believe gas dwell time.
    We’ve got some armorers around here somewhere that know this much better than I do.
    Last edited by RegularGuy461969; 03-25-2019 at 08:14 PM.
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  2. #12
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    for official length are you suppose to measure from the breach face?

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