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Thread: Colt 6920 vs 6721

  1. #1
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    Colt 6920 vs 6721

    What is the difference between the Colt 6920 compared to the Colt 6721 other than the 6721 has a heavy barrel and a 1x9 twist?

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    Quote Originally Posted by Roklok View Post
    What is the difference between the Colt 6920 compared to the Colt 6721 other than the 6721 has a heavy barrel and a 1x9 twist?


    That's the basic difference. With the appropriate bullets, the 6721 will be more accurate than the 6920.






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  3. #3
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    barrel profile, twist ratio and rollmarks
    *** Damn Proud to Be an American Ally ! ***

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    6721 v. 6920

    The previous posters nailed it (twist, HBAR).

    I've owned both. Still have the 6920 and would buy another in a heartbeat.

    Didn't care for the extra weight of the 6721. Not one bit.

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    Is there an advantage to an HBAR vs an m4 profile in a 16 inch rifle?

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    Quote Originally Posted by metroATL View Post
    Is there an advantage to an HBAR vs an m4 profile in a 16 inch rifle?
    Maybe in a bench rest rifle, but not in a carbine that's going to be carried and shot off hand.
    Employee of colonialshooting.com

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    Quote Originally Posted by metroATL View Post
    Is there an advantage to an HBAR vs an m4 profile in a 16 inch rifle?
    Accuracy. The pic below shows a comparison between a Colt 16" HBAR and a Colt 16" M4 (government profile) barrel. Three 10-shot groups were fired from each barrel at a distance of 100 yards. The 10-shot groups were over-layed on each other using RSI Shooting Lab and the mean radii were calculated for the 30-shot composite groups.

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  8. #8
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    My Colt 16" 1:9 HBAR far out shoots any of my M4 profile barrels from any maker. The weight difference means little to me.

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    I have a HBAR while other 2 friends of mine have a M4profile and a lightweight....all of 3 are 16'' Colt carbines.

    during a dynamic shooting match I liked the extra weight of my hbar; the lightweight carbine recoil is too different for my taste.
    but the M4profile is the perfect compromise.
    *** Damn Proud to Be an American Ally ! ***

    The Armory:
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    I had to trade my 6721 because my daughter needed to shoot out to 600 yards. The 1 x 7 twist handles heavier rounds better than the 1 x 9.

    She used the my 6920 during her first match last June, afterthat I traded the 6721 for a RRA NM4....

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