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Thread: Colt 6721

  1. #1
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    Colt 6721

    What do you all think of the 6721 ? mt understanding is that the only differance is the 1/9 twist and barrel profile . Seems that alot of departments are using th 6721

  2. #2
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    It's a good gun. I have an LE version I got during the ban years. The only thing that I wish was different is the ramped/half circle carrier.

    Colt didn't always put M16 carriers in even the LE guns.

  3. #3
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    They are very heavy for a carbine, and 1/9 isn't for shooting 70GR and up rounds....but other than that they are a good gun of typical Colt quality.


    New ones should come with the fat M4 handguards, M4 stock, M16 BCG, standard size trigger pins, carry handle, etc.




    Basically just a 6920 with a different roll mark and barrel.

  4. #4
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    I have one,
    its a good gun and the weight helps keeping the carbine tacticool-crap-free
    I prefer 1/7 as all around twist ratio but 1/9 works great too...not a huge difference
    *** Damn Proud to Be an American Ally ! ***

    The Armory:
    Colt 6601 - Colt 6731 - Colt 613 - Steyr StG.58 - M1 Carbine - CZ Scorpion EVO - Franchi PA8 - Glock 17 - Pietta/Colt SAA 1873 - SA 1911A1 Mil Spec - Ruger LCP


  5. #5
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    they are gtg...i carried one in my trunk for several years. if you see one at a decent price grab it, otherwise just get a 6920.
    “If you want a guarantee, buy a toaster.”

  6. #6
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    1/9 twist and a heavy barrel. If those aren't an issue for you, it's a great choice with typical Colt quality and reliability.
    2012 National Zumba Endurance Champion
    Hi Point 9mm, Lorcin .22, Bushmaster Carbon 15, Norinco SKS, Leapers 10x

    الدهون القاع الفتيات لك جعل العالم هزاز جولة الذهاب

  7. #7
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    I thought they were just a 6920 with a factory 14.5'' barrel.

    Damn. I was wrong. Glad I didn't advise anybody to buy one.

    Last edited by Magic_Salad0892; 05-23-10 at 04:28.
    Quote Originally Posted by montanadave View Post
    My wife has already written my obituary which, in part, attributes my death to complications from my second penis reduction surgery.
    We miss you, AC.

  8. #8
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    Yeah. That's the 6921 I believe.

    I probably wouldn't buy a 6920 or 6721 today. If I'm going to have a carbine gas system, I'm not going to suffer with a full 16" of barrel too.

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  10. #10
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    Quote Originally Posted by markm View Post
    It's a good gun. I have an LE version I got during the ban years. The only thing that I wish was different is the ramped/half circle carrier.

    Colt didn't always put M16 carriers in even the LE guns.
    If yours has the hardened steel block in the lower preventing the use of a M16 carrier and want it removed check out www.HatfieldsGunsmithing.com. I've seen two they did and they do an excellent job of the removal of it. Then you could add whatever trigger you want into the lower as well as use a genuine Colt M16 carrier.
    FFL/SOT armorer

  11. #11
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    I really love mine. This Hbar 1:9 is my most accurate factory Colt rifle, 6940 included. It will shoot up to 75gr Tap ammo very very well. Mine is fully dressed, definitely heavy and I also run a skeletonized Redi-Mag set up. Weight does not an issue as I kinda like the heft. Out of all of my rifles, including my issued M4A1, I still chose to run this rifle as my primary duty weapon.

  12. #12
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    I dig my 6721, which has been in use for about 12 yrs. It's a great shooter, but can get a tad heavy during an extending training period or while on containment for a long period of time.

  13. #13
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    My favorite model of all my former and current Colt models, hence my screen name, I like it because it's actually marked AR-15A3 Tactical Carbine.

    The top picture is my older 6721 (FDE furniture with Rock Creek-Compass Lake Engineering-GTS midlenth medium contour barrel) upper and lower receivers probably made during the end of the AWB, below it is my new 6721 carbine I bought two months ago, date stamp on the barrel is 05/ 09 and the bottom pic is my same new carbine with my personal upgrades.

    The HBAR heavy barrel doesn't bother me much the only small thing that I would like is if they make them in the future with 1/7 twist maybe just a limited production run would be nice, but the 1/9 twist is not so bad because I usually use 55 gr ammo for practice anyway.

    These new 6721 models comes with the new small size 0.154" dia. hammer and trigger pins, M4 handguards with double layer heat shields, new reversible selector lever, M16 auto BCG, H buffer and on my carbine the trigger is excellent for a production gun compared to my six former and my other two current Colts.
    YMMV

    AR-15 SP1 owner since 1971
    NRA and CRPA life member

  14. #14
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    Yup, Colt's Tactical Cannon is a brute. I run mine with A1 butt, which is a big plus in getting it to
    balance out. Very accurate, good trigger, and mine also has the M16 BCG, and M4 handies.
    She is a pleasure to shoot, and the "feel" of her in your hands just inspires a load of confidence!
    Perhaps not the best choice for a first AR, but wadda piece!

  15. #15
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    The barrel on the Colt 6721 is one of the most accurate “off the shelf” chrome-lined, NATO chambered barrels that I’ve tested. The 10-shot group pictured below was fired from a free-floated 6721 during accuracy testing.














    Last edited by Molon; 05-26-10 at 09:14.
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  16. #16
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    Thanks , for alll of the info. I am going to pich mine up after this weekend. I am not sure if I am going to leave it alone or add a few accessories to it ?

  17. #17
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    Wow, that's damn accurate.

    Makes me wonder. What is the most accurate barrel you've tested?
    Quote Originally Posted by montanadave View Post
    My wife has already written my obituary which, in part, attributes my death to complications from my second penis reduction surgery.
    We miss you, AC.

  18. #18
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    Quote Originally Posted by Magic_Salad0892 View Post
    Wow, that's damn accurate.

    Makes me wonder. What is the most accurate barrel you've tested?

    So far, my Krieger barreled AR-15s have been the most accurate.






    Last edited by Molon; 05-26-10 at 09:21.
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  19. #19
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    Couple of 6721LE questions here. How do you all feel about this weapon with a UBR stock? For handling?,
    For balance? Then, would you be better off with this piece, or a 6721LE with a SOCOM barrel, or similar
    Carbine? For general use? I've tried another member's 6721 with a fixed stock, and it does handle way
    better.....would the UBR help in this regard?

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