Colt AR Match HBAR question

Discussion in 'AR Talk' started by tweedman, Mar 12, 2011.

  1. tweedman

    tweedman XDTalk Newbie

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    Just picked up a used Colt Match HBAR rifle. The lower says 223. But the barrel markings between the front sight and the brake are: C MP 5.56 NATO 1/7 HBAR. I understand the C is for Colt and MP is Mueller Brass.

    So my question is: Do I have a mismatched upper? Caliber goes by the barrel markings, right? Any idea what I've got?
     
  2. mvician

    mvician XDTalk 5K Member Founding Member

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    The MP is for magnipartical tested.
    5.56 is the chamber on the barrel,
    for whatever reason Colt marks the civilian lowers
    as .223
     
  3. tweedman

    tweedman XDTalk Newbie

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    So this is normal. It is a match barrel and it's ok to run 5.56 Nato ammo through this puppy?
     
  4. treehugger49

    treehugger49 XDTalk 1K Member

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    Absolutely. You may run either .223 or 5.56 through any barrel marked 5.56.
     
  5. Mercmar

    Mercmar XDTalk 5K Member

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    Hmmmmm. 5.56 marked on barrel. Hmmmmm. That's a toughie! :cool: Of course, you can use 5.56 ammo in a 5.56 barrel. You could mark "12 gauge Magnum" on the lower, and it wouldn't make any difference as to what you could fire through the barrel.
     
  6. tweedman

    tweedman XDTalk Newbie

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    Thanks for the replies guys. I'm good with the caliber designation.

    But I'm still confused if this is the upper that originally came with this AR and if it's a match target barrel. Any more stabs at this?
     
  7. mvician

    mvician XDTalk 5K Member Founding Member

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    Pics of the rollmark on the lower and of the complete rifle would help.

    Or google Colt Match Target HBAR or Colt MT 6601 and compare pictures
     
  8. tweedman

    tweedman XDTalk Newbie

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    After deep digging through Google, I believe the upper is stock correct. Here are some images of a very close serial# AR with identical markings.

    Still confused though. Looks like the chambering is in 5.56 NATO. But wouldn't a Match Target gun be more accurate in 223? Unless you are specifically using 5.56? But why is the lower marked differently than the barrel? One of Colt's quirks?

    Thanks Guys! I appeciate the help on this.
     

    Attached Files:

  9. mvician

    mvician XDTalk 5K Member Founding Member

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    Stop over thinking it already :lol:

    Colt marks their LE and .mil lowers with 5.56
    They mark the "Match Target" and other civie lowers as .223
     
  10. tweedman

    tweedman XDTalk Newbie

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    ok,ok,ok! ;)
     
  11. SeaDog0824

    SeaDog0824 XDTalk Newbie

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    I had the same question... thank goodness the forum had the answer. My understanding is that I can shoot 223 out of a 5.56 stamped barrel, but NOT the other way around...the "throat" distances are different: the 223 is almost have as short as the throat distance on the 5.56. The photos that were attached by another user match the markings on my HBAR to a T. I'm glad I did a little research. :D
     
  12. misfit-x

    misfit-x XDTalk 1K Member

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    When in doubt call Colt! I'm sure if you give them the serial number they can look it up and give you all the info you need for the price of a phone call.
     
  13. Devin.Morris.007

    Devin.Morris.007 XDTalk 2K Member

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    I never really paid attention, but mine is like that too. I have a Match Target Competition HBAR II. My lower is stamped for .223 with a barrel on the upper for 5.56 as well.

    Like they said, it doesn't really matter what is stamped on the lower, its just what is stamped on the barrel. My barrel is actually stamped for both 5.56 and .223. If it wasn't, then what SeaDog said is true. You can shoot 223 out of a 5.56 barrel but not the other way around. The thing about the throat distances might be true, but it was my understanding that it had to do with cartridge pressure and barrel rifling. Someone please correct me if I'm wrong.
     
  14. MikeyLikesCarbonFiber

    MikeyLikesCarbonFiber XDTalk 1K Member

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    My lower isn't stamped with a caliber but my barrel is stamped 5.56

    [​IMG]
    [​IMG]

    When I bought my Colt from my LGS, they told me that mine is some special version or something like that. It also came with a factory installed Rogers Super-Stoc
    http://www.holsterops.com/rogers-super-stoc
     
  15. birddog

    birddog XDTalk Member

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    My colt match target competition HBAR is marked lower .223 and barrel c mp 5.56 nato 1/9
     
  16. Mr. YACYAS

    Mr. YACYAS XDTalk 2K Member

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    I don't know whats special about it but hang on to the Sporter I'm not sure if Colt is going to make them much more. I have a Sporter 6920
     
  17. MikeyLikesCarbonFiber

    MikeyLikesCarbonFiber XDTalk 1K Member

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    :D I don't what's "special" about it either but every other Colt I've seen has the basic adjustable butt stock. Mine came with the a Colt Defense Rogers Super-Stoc from the factory.
     
  18. WantBigBoom

    WantBigBoom XDTalk 500 Member

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    A .223 chamber has a shorter throat, and military 5.56 is loaded to a higher pressure. .223 Remington is a SAAMI spec pressure loaded round when measured in a .223 SAAMI spec chamber. A higher pressure round in a tighter throated chamber will increase the chamber pressure beyond the published SAAMI approved data, which is why the safe advice is to NOT fire 5.56 in a .223 chamber, but it is safe to fire .223 in a 5.56 chamber.

    Will doing the opposite blow your rifle up? Probably not, BUT that's a personal risk. Guys hand loading for match shooting have been known to use the tighter (which can sometimes be more accurate) .223 chamber and load hotter than 5.56. These guys also spend the time to work up a safe loading for THEIR specific rifle (and every rifle is different), to maintain a level of safety, not just throw in a hot round to "see what happens".
     
  19. Mercmar

    Mercmar XDTalk 5K Member

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    There is no industry standard for calling a barrel a "match" barrel. That's just marketing b.s. Every aftermarket Glock barrel I've ever seen, whether it was $85 or $385 claimed to be a "match" barrel.

    If your Colt Hbar "match" will outshoot a RRA Predator Pursuit, I'll eat the Colt, piece-by-piece. :cool:
     
  20. MikeyLikesCarbonFiber

    MikeyLikesCarbonFiber XDTalk 1K Member

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    This was never a debate on why the Colt is labeled "Match" and/or how it will out shoot anything. BUT if you want to get into that the rifle is only a small part of "out shooting" ... I'm no sharpshooter but when I do tactical training I've out shot plenty of people who have custom $3000+ AR's. I've out shot people with top of the line Daniel Defense AR's and in the last training I did I out shot 2 people that had LWRC Comp AR's.

    Go easy with the my d!ck is bigger then yours stuff ... :cool:
     

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