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Thread: 1:9 twist AR barrel

  1. #1
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    1:9 twist AR barrel

    I have two AR's with the 1:9 twist is this ok for 50 grain, 55 grain or how does 60 grain do?

  2. #2
    Senior Veteran Woodman in MO's Avatar
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    I think that they will all be fine. It's when you get to the 1:8 that you have to go with a heavier grain.

    Edit...I'll say that when you may have not have.
    "When shoes and clothes and food, when even hope is gone, we'll have the rifle."

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    Senior Veteran nevada's Avatar
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    Looking around the WWW, it seems no one really knows. I've seen 45gr to 73 gr, with statements that 1:9 is for heavier bullet weights: 60gr to 72gr. My mini14 is 1:9 twist and shoots 55gr and 62gr very well. Barrel thickness, length and harmonics all come into play. So it really comes down to: see what your particular rifle likes. This is a great reason to go shooting.
    RRRROOOWWWRRR PHHT PHHT I AM THE FORCE!

  4. #4
    Senior Veteran rep30cal's Avatar
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    My 1/9 twist rifles will shoot 50-62 grain bullets just fine with a little less
    accuracy from the 50's. I have a Colt with a 1/7 twist and it is particular
    to what 50's it will shoot, it will spin the jackets off of Hornady SX and
    Sierra Varminters or keyhole them, but Nosler ballistic tips in 50's worked
    fine.

    Just an added note, my 1/7 loves the 60 grain Sierra Varminters.

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    Buffing trigger parts for better break...

    I built a m4gery using DPMS trigger assembly how do you buff the trigger parts to get a smoother trigger pull or break?

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    What's your BBL lenght?

    Quote Originally Posted by nuckldust View Post
    I have two AR's with the 1:9 twist is this ok for 50 grain, 55 grain or how does 60 grain do?
    If your BBL is 16" 1x9 it will handle up to a 62gr bullet. If it's 18"+ it will handle up to a 77gr bullet. The only time you're going to need a 1x7 or 1x8 twist BBL is when you are shooting a 63gr to 77gr bullet out of a 16" BBL or shorter @ 400+ yards.
    I read in some Govt. literature ( I think Army Times ) that said the 1x7 twist was too much twist for the MK262 ( 77gr ) & was recommending that the Army go to a 1x8 twist, but I've also read where GI's say they are getting kills @ 800yds.
    I use the same 14.5" 1x7 BBL & ammo they do & I have no problems with it @ 400yds ( the max distance of my range ).

  7. #7
    Senior Veteran rep30cal's Avatar
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    I would almost say to get an aftermarket adjustable trigger or BE VERY
    CAREFUL working the AR triggers. The catch on the hammer that sets
    up on the trigger is fairly small and if you remove to much surface area
    then it will not reset right and could cause an accidental discharge or
    slam fires. On the other hand the hardening of the hammer spur is
    shallow enough that it is real easy to hone or stone through the hard
    area and into the softer metal, then the hammer spur will beat itself
    silly and mushroom. Then the trigger reset is worse than the first
    scenario. I tried a trigger group that was an unknown used group, it
    was mushroomed just slightly and when the hammer reset after the
    first shot, it would not release again without opening the gun, it jammed
    up everything and is why you need to bench test the trigger group for
    function.

  8. #8
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    Why put yourself through all that when you can get a RRA 2 stage trigger for $88. I've got them all my ARs & I'll never use a STD trigger set again.

  9. #9
    97th Signalman's Avatar
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    RRA 2 stage triggers

    Quote Originally Posted by GearHD View Post
    Why put yourself through all that when you can get a RRA 2 stage trigger for $88. I've got them all my ARs & I'll never use a STD trigger set again.
    I checked out the Rock River Arms website for their NM 2-stage triggers. The list them at $120. Is there some other 2-stage trigger that they sell for $88?

    97th Signal Bn, 7th Army Main Communications, Germany, 1960-63

  10. #10
    Senior Veteran cfish's Avatar
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    Ya where did you get one for 88.00 I want one at that price. Please tell us your source.
    knuckledust your fine up to 68gr in 1x9 in 16". I wouldn't go lower then 50 gr for plinking. I have had great succes with 68 gr and lower anything higher and starts to have fly aways.
    Last edited by cfish; 02-06-2008 at 05:23 PM.


    COG#1963

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