What twist rate do military M4's have?

Discussion in 'Black Rifle Forum' started by mknherhappy, Apr 6, 2010.

  1. mknherhappy

    mknherhappy

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    Anyone know for sure what twist rate the military M4's have?

    Thank you.
     
  2. faawrenchbndr

    faawrenchbndr CLM

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    Current M4s have a 1-in-7
     

  3. mangkukhan

    mangkukhan

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    I believe it's 1:7.
     
  4. Alaskapopo

    Alaskapopo NRA ENDOWMENT

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  5. Glockdude1

    Glockdude1 Federal Member CLM

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  6. kabob983

    kabob983 "Mostly" Dead

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    Haven't you heard? Obama is getting rid of all guns for the military because it makes us look mean. Our new standard issue slingshots have a 1/1 twist ratio.
     
  7. Onmilo

    Onmilo

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    1 in 7 with modified feed ramps now.
     
  8. johnson8861

    johnson8861 Daddo Chomper

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    Yeah, it's 1/7, I figured someone else would have posted it, but i wanted to sse my own typing.
     
  9. AK_Stick

    AK_Stick AAAMAD

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    All my M-4's are 1/7
     
  10. faawrenchbndr

    faawrenchbndr CLM

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    Hey,.....I think they are 1/7 twist.:whistling:
     
  11. vafish

    vafish

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    Current US Military M4's have a barrel twist rate of 1 turn in 7 inches.
     
  12. glock22357

    glock22357 Got Ammo???

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    M4s have a 1/7 twist rate.:rofl:
     
  13. Boost_Junkie

    Boost_Junkie Mike November

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    IB1:7 twist....


    Manny
     
    Last edited: Apr 7, 2010
  14. mvician

    mvician Lifetime Member

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    and now for an added twist on the question (pun intended).

    Why do they have a 1:7 twist?

    :supergrin:
     
    Last edited: Apr 7, 2010
  15. raven11

    raven11

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    the original 1:7
     
  16. F350

    F350

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    To stabilize tracer rounds; 1:9 gives good performance with 69gr projectiles
     
  17. Alaskapopo

    Alaskapopo NRA ENDOWMENT

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    69's are ok but 77's are better.
    pat
     
  18. The Machinist

    The Machinist Please! Please! No more!

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    1:7 crew checking in!
     
  19. faawrenchbndr

    faawrenchbndr CLM

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    Because of the CHART! :faint:
    It says a mil-spec M4 must have a 1:7 barrel rifling rate. :supergrin:


    [​IMG]
     
  20. HAIL CAESAR

    HAIL CAESAR Senior Member

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    I must agree that is one part of the chart that folks get all bent out of shape on, even though it is only a informational chart.

    The 1/7 is NOT needed if you only ever plan to shoot 55 grains.

    I will once again plead for the AR makers to make a 1/8 twist 5.56 CL M4'ish type barrel. If they would make this they could drop the 1/7 and 1/9 different offerings and just have one good barrel you could shoot the short 45 grainers to the longest you could stuff in a mag.