Question about ar-15

jaywaptijaywapti Senior MemberPosts: 4,122 Senior Member
I have an older Colt Match H-Bar AR-15, it is chambered for the .223 and thats all i have ever used in it, i know there is a difference between the .223 chamber and the 5.56 chamber. what i want to know is it safe to fire 5.56 ammo in a .223 chamber ?

JAY
THE DEFINITION OF GUN CONTROL IS HITTING THE TARGET WITH YOUR FIRST SHOT

Comments

  • bisleybisley Senior Member Posts: 9,658 Senior Member
    Officially speaking, no, it isn't safe.

    But, lots of folks do it, and I have never heard about an injury resulting from it. I don't do it, but if it was necessary for some reason...
  • Big ChiefBig Chief Senior Member Posts: 30,080 Senior Member
    It's only true if it's on this forum where opinions are facts and facts are opinions
    Words of wisdom from Big Chief: Flush twice, it's a long way to the Mess Hall
    I'd rather have my sister work in a whorehouse than own another Taurus!
  • Gene LGene L Senior Member Posts: 9,332 Senior Member
    Good link, Big Chief. Long, but tells you all you need to know.
    Not too many problems you can't fix
    With a 1911 and a 30-06
  • PegasusPegasus Senior Member Posts: 2,467 Senior Member
    jaywapti wrote: »
    I have an older Colt Match H-Bar AR-15, it is chambered for the .223 and thats all i have ever used in it, i know there is a difference between the .223 chamber and the 5.56 chamber. what i want to know is it safe to fire 5.56 ammo in a .223 chamber ?

    JAY

    What does it say on the barrel, if anything?
  • jaywaptijaywapti Senior Member Posts: 4,122 Senior Member
    Pegasus wrote: »
    What does it say on the barrel, if anything?

    Nothing on the barrel, just .223 on the lower receiver.

    JAY
    THE DEFINITION OF GUN CONTROL IS HITTING THE TARGET WITH YOUR FIRST SHOT
  • PegasusPegasus Senior Member Posts: 2,467 Senior Member
    The first thought that comes to mind is: "that's meaningless." But I have heard of these rifles that were indeed chambered for .223 as it's a better chamber for competition. The Wylde chamber came latter. The barrel and all the other parts are the same for either cartridge, the only meaningful difference being the leade in the barrel. Also, a NATO chamber will not be as tight as a .223 Remington but that's not the issue here. It's really about the bullet being to close to the lands with a .223 chamber. The M193 and especially the M855 have the bullet very close or even at the lands in a true .223 chamber.
  • Jeff in TXJeff in TX Senior Member Posts: 1,181 Senior Member
    I've read a bunch of many articles and threads in the past that said this was a non-issue. I always looked at it like the .308 and 762 Nato round basically the same thing a non issue. I know some will argue but we've never seen an issue with it.
    Distance is not an issue, but the wind can make it interesting!

    John 3: 1-21
  • PegasusPegasus Senior Member Posts: 2,467 Senior Member
    Jeff in TX wrote: »
    I've read a bunch of many articles and threads in the past that said this was a non-issue. I always looked at it like the .308 and 762 Nato round basically the same thing a non issue. I know some will argue but we've never seen an issue with it.

    I disagree; while the 7.62 Vs .308 is really a non issue, there is definitely something to the .223 Vs 5.56 thing. The chambers in the latter ARE different and the 5.56 IS loaded hotter than SAAMI .223 Rem. Whether those two issues will cause a problem in a specific rifle, that's is debatable.
  • NCFUBARNCFUBAR Senior Member Posts: 4,173 Senior Member
    jaywapti wrote: »
    Nothing on the barrel, just .223 on the lower receiver.

    JAY

    May have to remove the handguard but Colt barrels will be stamped for sure ...

    Now the following is just speculation and I still would not fire 5.56 unless it was a last resort unless you can verify for sure the barrel is stamped 5.56. Quite a few Colt receivers were stamped .223 for the commercial market but the barrels were still 5.56.
    “The further a society drifts from truth ... the more it will hate those who speak it."
    - George Orwell
  • Jeff in TXJeff in TX Senior Member Posts: 1,181 Senior Member
    Pegasus wrote: »
    I disagree; while the 7.62 Vs .308 is really a non issue, there is definitely something to the .223 Vs 5.56 thing. The chambers in the latter ARE different and the 5.56 IS loaded hotter than SAAMI .223 Rem. Whether those two issues will cause a problem in a specific rifle, that's is debatable.

    I'll agree after doing a bit of reading on the internet while stuck at the airport waiting on my flight!
    Distance is not an issue, but the wind can make it interesting!

    John 3: 1-21
  • Gene LGene L Senior Member Posts: 9,332 Senior Member
    The chambers of non-match ARs should present no problem, which is what you get from reading the article. Machining being what it is, even the best production guns have enough variation in them as to make a "true" chamber something of a myth. An AR chamber will usually be larger than a typical bolt gun, which will reduce pressure.

    I know of no instances of ARs being blown apart by using .223 instead of 5.56. Or the other way around, for that matter. I think it's a gun range myth.
    Not too many problems you can't fix
    With a 1911 and a 30-06
  • jaywaptijaywapti Senior Member Posts: 4,122 Senior Member
    NCFUBAR wrote: »
    May have to remove the handguard but Colt barrels will be stamped for sure ...

    Not under the handguard,but very lightly stamped between the front site and muzzle C MP 5.56 NATO 1/7 H-BAR

    So i assume its got a 5.56 chamber and safe to use either ammo.

    JAY
    THE DEFINITION OF GUN CONTROL IS HITTING THE TARGET WITH YOUR FIRST SHOT
  • NCFUBARNCFUBAR Senior Member Posts: 4,173 Senior Member
    jaywapti wrote: »
    Not under the handguard,but very lightly stamped between the front site and muzzle C MP 5.56 NATO 1/7 H-BAR

    So i assume its got a 5.56 chamber and safe to use either ammo.

    JAY

    C - chrome lined ... MP - magnetic particle inspected ... 5.56 NATO - chambering ... you know the rest 1/7 - twist ... H-BAR. Colt just stamped the lower different from military contracts then but put the same barrels in both.
    “The further a society drifts from truth ... the more it will hate those who speak it."
    - George Orwell
  • knitepoetknitepoet Senior Member Posts: 16,561 Senior Member
    jaywapti wrote: »

    So i assume its got a 5.56 chamber and safe to use either ammo.

    JAY
    And you would be correct. 5.56, NATO, 223 Rem, that barrel should handle it all with aplomb
    Seven Habits of Highly Effective Pirates, Rule #37: There is no “overkill”. There is only “open fire” and “I need to reload”.


  • earlyearly Senior Member Posts: 4,950 Senior Member
    I recall an outfit that sold a reamer with an fixed stop to lengthen the lead of civilian chambers to military specs. I dont remember who marketed it, but I got the impression the mod was for reliability on rifles intended for serious use, as 5.56 in a 223. could cause a stoppage. Maybe it was hype to sell a gadget, I don't know.
    My thoughts are generally clear. My typing, not so much.
  • BigslugBigslug Senior Member Posts: 6,590 Senior Member
    early wrote: »
    I recall an outfit that sold a reamer with an fixed stop to lengthen the lead of civilian chambers to military specs. I dont remember who marketed it, but I got the impression the mod was for reliability on rifles intended for serious use, as 5.56 in a 223. could cause a stoppage. Maybe it was hype to sell a gadget, I don't know.

    Ned Christiansen of Michiguns, both the gauge to determine what you have, and the reamer to make it 5.56: http://www.m-guns.com/tools.php Used it a couple times to deal with primer-popping issues on non-Colt barrels, including one on an 11" full auto operating at darned high gas port pressures. Worked like a champ.

    You could write a fairly sizeable pamphlet titled "Colt Lower Receiver Markings Through the Ages" There's some bizzare stuff for those into such arcane lore, but suffice to say, it's all irrelevant to the barrel. Colt has probably made some barrels that are .223, not 5.56, but they'd be in the EXTREME minority, and they wouldn't be on anything that looked like a GI M16 with a phosphate finish and a tringular front sight.
    WWJMBD?

    "Nothing is safe from stupid." - Zee
  • Gene LGene L Senior Member Posts: 9,332 Senior Member
    Most ARs have a NATO chamber, or so I hear. They'll fire anything in the ballpark. If I was worried about it, I'd have spent a lot more money on specific ammo.

    Bolt guns? I don't know, but I wouldn't worry about that, either. Sometimes I think we buy trouble by overthinking things that would otherwise be simple.
    Not too many problems you can't fix
    With a 1911 and a 30-06
  • JasonMPDJasonMPD Senior Member Posts: 6,056 Senior Member
    I've only ever owned one AR that I would not feed 5.56 NATO. It was a Rock River Arms varmint upper with a match 223 chambered barrel.

    Other than that no biggie. Ammo manufactures have even been known to mislabel ammo--especially in the 7.62/308 realm.


    Sent from my iPhone using Tapatalk
    “There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves.” – Will Rogers

Leave a Comment

BoldItalicStrikethroughOrdered listUnordered list
Emoji
Image
Align leftAlign centerAlign rightToggle HTML viewToggle full pageToggle lights
Drop image/file