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Thread: Is 1/9" twist a deal breaker?

  1. #31
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    It depends on the barrel length and bullets you prefer.

    It is all about rotational velocity. 1:9 in a 20 inch barrel is not as bad as in a 7.5 inch barrel.

    I would want 1:6 for a barrel under 9 inches, 1:7 for a barrel 9-20 inches, and 1:8 for a barrel over 20 inches.

    Even for a long barrel length, I would consider 69 grain to be the max for a 1:9. If you want the capability to shoot 75 and 77 at sea level or in cold weather, then you need 1:7.

    Is 1:7 significantly worse for 55 grain bullets? I doubt it. I have not seen anyone do a proper comparison test. You could order 10 barrels of 1:7 and 10 in 1:9 have have them made at the same time on the same cut-rifle machine and then compare them with 30 shot groups. That is under 1000 rounds of ammo.

  2. #32
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    AR barrels are easy enough to swap where if you're getting a decent deal on the rifle, it's not a deal breaker. for me anyway.

  3. #33
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    Quote Originally Posted by winfield813@yahoo.com View Post
    Not sure about the twist of the Vietnam A1, but if the engagements were in heavy jungle (before the Agent Orange had fried much of the vegetation) simply hitting branches between the target and the muzzle could be a reason for bullets tumbling as much as anything else. Just speculating.
    i think that's why the 5.56 round got such a bad reputation in vietnam. the whole "i shot him 10 times and it didn't do anything to him" thing... bullets hitting little branches and tumbling off target. our guys in the desert seem to have much less issue with the round. the long reach and light, easy to carry ammo really helps out there.

  4. #34
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    I prefer 1:7 no doubt and that is what I mostly buy.

    Having said that, some of the most accurate carbine barrels I have come across are the 1:9 Colt HBar's shooting 55gr. Even my 1:9 Hbar does well with 75gr TAP.

    Since we are mandated to using 55gr as duty issue (as of right now), I opt for my 16", 1:9 HBAR 6721, which loves that ammo, over our issued M4A1's. Yes, I even like the weight of the fully dressed Hbar.

  5. #35
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    Quote Originally Posted by skyugo View Post
    AR barrels are easy enough to swap where if you're getting a decent deal on the rifle, it's not a deal breaker. for me anyway.
    Not as true for a piston AR...

  6. #36
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    Quote Originally Posted by Todd.K View Post
    Not as true for a piston AR...
    Or will completely void your warranty if it is the piston AR that will remain nameless

  7. #37
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    Deal breaker? Only on the interwebs.

  8. #38
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    Quote Originally Posted by steeltoe View Post
    Deal breaker? Only on the interwebs.
    Deal breaker if you want to shoot good ammo (75 and 77 grain)
    Pat
    Serving as a LEO since 1999.
    USPSA# A56876 A Class
    Firearms Instructor
    Armorer for AR15, 1911, Glocks and Remington 870 shotguns.

  9. #39
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    Quote Originally Posted by Alaskapopo View Post
    Deal breaker if you want to shoot good ammo (75 and 77 grain)
    Pat
    If you really want to step up to the plate you'd be slinging 115gr. 6.8x43mm... or even 7.62x39, or possibly 7.62x51mm.

    .50 Beowolf will probably knock 'em deader than dead... or at least by all Interweb accountz.

    We understand your position by now... lethality and ninja flips above all else, but for a primary use range gun w/ primary fodder of M193, the situation calls for a 1/9. I'd also recommend the OP check out some of the other options available as far as soft points and ballistic tips to enhance the lethality in the home defense role without increasing penetration.

    It's completely absurd to call a 1/9 barrel a "dealbreaker."

  10. #40
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    Quote Originally Posted by KalashniKEV View Post
    for a primary use range gun w/ primary fodder of M193, the situation calls for a 1/9.
    why?

    .

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