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  #1  
Old 01-31-2020, 09:26 PM
NonHyphenAmerican NonHyphenAmerican is offline
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Need Colt AR-15 A2 Information

Need Colt AR-15 A2 Information

Recently bought a LEO Surplus Colt AR-15 A2.

The Lower is marked .223, but the barrel is marked CMP 5.56mm 1/7

So is this rifle capable of safely shooting both .223 Rem and 5.56 or is it safe to only shoot .223 in it?
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Old 01-31-2020, 11:32 PM
BBBBill BBBBill is offline
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Go with the barrel markings. That should reflect the real chambering. A 5.56 chamber will handle either 5.56 or .223.
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Old 01-31-2020, 11:33 PM
7.62Kolectr 7.62Kolectr is offline
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Barrel marks designate correct caliber which is 5.56.
It’ll shoot both calibers just fine.
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  #4  
Old 02-01-2020, 05:45 AM
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Faawrenchbender Faawrenchbender is offline
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As stated, always default to the barrel markings
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Old 02-01-2020, 09:47 AM
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Until the internet said that shooting 5.56 ammo in a 223 marked barrel was bad, I had shot many thousands of 556 rounds in my 223 barrels.
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Old 02-01-2020, 10:50 AM
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If I'm not mistaken the Ruger Mini-14 is marked .223 but has a 5.56mm chamber as well.
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Old 02-01-2020, 08:06 PM
NonHyphenAmerican NonHyphenAmerican is offline
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Thanks Y'all for the verification.

I "Thought/Assumed" that the barrel marking would be the correct chambering, but figured I'd double check.

Again, Thanks.
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Old 02-01-2020, 08:44 PM
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Faawrenchbender Faawrenchbender is offline
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Quote:
Originally Posted by dsk View Post
If I'm not mistaken the Ruger Mini-14 is marked .223 but has a 5.56mm chamber as well.
Very true Sir
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Old 02-01-2020, 08:56 PM
NonHyphenAmerican NonHyphenAmerican is offline
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This is the latest addition.
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8023190B-FBF4-4736-A6E3-09927756F7E4.jpeg  
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I hope and pray that none may kill me, Nor I kill any, with woundings grim. But if ever any should think to kill me, I pray thee, God, let me kill him first
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Old 02-01-2020, 11:16 PM
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dsk dsk is offline
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Quote:
Originally Posted by NonHyphenAmerican View Post
Thanks Y'all for the verification.

I "Thought/Assumed" that the barrel marking would be the correct chambering, but figured I'd double check.

Again, Thanks.
It's always better to ask a dumb question than make a wrong assumption. Nobody wants to blow themselves up putting the wrong ammunition in a firearm.
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Avoid the temptation to replace everything on your brand-new 1911 just to make it "better". Know what you're changing out and why. You may spend a lot of money fixing things that weren't broken to begin with. Shoot at least 500 rounds through it first, then decide what you don't like and want to improve. Regarding vintage 1911s, pre-1970 pistols are highly collectible in original, unaltered condition and should NEVER be refinished or modified as it completely ruins their monetary value.
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  #11  
Old 02-02-2020, 06:23 AM
CLASSIC12 CLASSIC12 is online now
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Need Colt AR-15 A2 Information

Nice rifle you got yourself, congratulations.

I was told long ago that the 5.56 marked Colt barrels were gtg with 5.56 surplus ammo.

I’ve shot a lot of of those (S.African)





in these two A2 rifles with no ill effect.





I think all the civilian Colt AR-15s I have (A1 & A2) are marked .223 on the lower

The military rifles are marked 5.56






Last edited by CLASSIC12; 02-02-2020 at 06:29 AM.
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  #12  
Old 02-02-2020, 11:50 AM
fnfalman fnfalman is offline
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Quote:
Originally Posted by Tom Freeman View Post
Until the internet said that shooting 5.56 ammo in a 223 marked barrel was bad, I had shot many thousands of 556 rounds in my 223 barrels.
So true. Lol.
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  #13  
Old 02-02-2020, 09:45 PM
megafiddle megafiddle is offline
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Quote:
Originally Posted by dsk View Post
If I'm not mistaken the Ruger Mini-14 is marked .223 but has a 5.56mm chamber as well.
Is this only the tactical model?

My ranch model is marked 5.56 NATO.

-
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  #14  
Old 02-03-2020, 02:27 AM
wildphil wildphil is offline
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Quote:
Originally Posted by megafiddle View Post
Is this only the tactical model?

My ranch model is marked 5.56 NATO.

-
At some point, Ruger must have changed things with the Mini 14. I have an early model and it is marked .223.
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  #15  
Old 02-20-2020, 01:14 PM
1saxman 1saxman is offline
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The Colt lowers were marked '.223' for a long time after the barrels were chambered in 5.56. My 2006 AR15A3 (6721) is marked the same way. I don't know how long it continued.
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