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Optimal barrel twist on ar-15

Discussion in 'General Firearm Discussion' started by Blackelk, Dec 26, 2011.

  1. Blackelk

    Blackelk Salem Area New Member

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    I have been considering purchasing an ar but am curious about barrel twist. Not sure how it affects accuracy and the type of bullets it can shoot. If someone could shed a little light on this it would be great. Thanks
  2. drifter001

    drifter001 North Hollywood, CA New Member

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    on an ar15, the lower the twist rate, the more accurate youll be able to shoot heavier grain rounds. for instance, an 1/9 twist wont be able to shoot a 62 or 67 grain bullet as accurate as a say 1/7 twist. also take into account what you will be shooting and what bullet weights you will be shooting as well as how far out you will be shooting as well
  3. Ben Beckerich

    Ben Beckerich NW Oregon Bronze Supporter Bronze Supporter

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    Depends entirely on what the gun's for, and what kind of ammo you'll be shooting. For a varmint gun, you'll want a slow twist- 1/9 - 1/12. For a defense gun, you'll want a fast twist - 1/7, 1/8 at the slowest. If you're not sure, and just buying an AR because it's the cool thing to do, faster is better. 1/7 will fire everything from 80gr down to 45gr. The only stuff you can't put through a 1/7 are some hot/light varmint loads... some will just explode a few meters in front of the muzzle.
  4. nubus

    nubus Guest

    +1 to all of the above. You need to know what you're gonna do with it and what weight bullets you prefer to shoot.
  5. cyclesarge

    cyclesarge Eugene OR, DUH! We're ALL in the NORTHWEST Well-Known Member

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    That's like asking, what's the best tire? A "mudder" is gonna suck on your Corvette, and a high performance road tire is gonna suck on your Jeep Wrangler.
  6. Old Hick

    Old Hick Oregon Active Member

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    Been posted before, but here goes again.


  7. madcratebuilder

    madcratebuilder Ardenwald, OR Well-Known Member

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    Use the chart as a general guide. It's not exactly "bullet weight" it's the bullet "length" but longer bullets are heavier so everyone goes with bullet weight. For a general purpose rifle a 1/8 twist well handle about anything it can feed.