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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 10-15-2009, 11:45 AM
Rockhound Rockhound is offline
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Default Question on Ammo

I'm just building my first AR. I have a lot of .223 ammo. If I buy a 5.56 NATO upper, can I fire the .223 and if I can will there be any issues?

Thanks for any help
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Old 10-15-2009, 11:48 AM
johnrunner89 johnrunner89 is offline
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Very common question. If the AR-15 is for a 5.56 (Get an upper and lower that is chambered for 5.56 and you should be fine) than both .223 and 5.56 NATO will work.
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Old 10-15-2009, 11:48 AM
HappyG HappyG is offline
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Generally, if it's a 5.56 marked rifle, it can fire both 5.56 and .223 If it is a .223 marked rifled, only fire .223 and not 5.56 as the pressure in the cartridge may be too high and dangerous.
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Old 10-15-2009, 11:58 AM
CFV CFV is offline
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Is accuracy comprimised.... say between a 5.56 and a .223 barrel... the .223 would be more accurate with the .223 barrel
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Old 10-15-2009, 12:02 PM
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reidnez reidnez is offline
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Originally Posted by CFV View Post
Is accuracy comprimised.... say between a 5.56 and a .223 barrel... the .223 would be more accurate with the .223 barrel
Very marginally, perhaps (5.56 chamber specs are slightly more generous than .223 for reliability). You really wouldn't see a difference unless you were using all-match components, and match ammunition.

Get a 5.56-chambered upper and you are good-to-go. It's really that simple.
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Last edited by reidnez; 10-15-2009 at 12:06 PM..
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Old 10-15-2009, 12:05 PM
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reidnez reidnez is offline
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Quote:
Originally Posted by johnrunner89 View Post
Very common question. If the AR-15 is for a 5.56 (Get an upper and lower that is chambered for 5.56 and you should be fine) than both .223 and 5.56 NATO will work.
Just a clarification, lowers aren't "chambered" in anything. The only limiting factor is the size of the magazine well. Other than that, you can find uppers in a huge range of calibers which work with a standard lower.
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Old 10-15-2009, 12:06 PM
johnrunner89 johnrunner89 is offline
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Just a clarification, lowers aren't "chambered" in anything. The only limiting factor is the size of the magazine well. Other than that, you can find uppers in a huge range of calibers which work with a standard lower.
Yea I saw I typed that after I posted it, I meant to say the lower marked as 5.56 but even than a .223 lower should do fine.
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Old 10-15-2009, 12:07 PM
johnrunner89 johnrunner89 is offline
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Yea I saw I typed that after I posted it, I meant to say the lower marked as 5.56 but even than a .223 lower should do fine.
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Old 10-15-2009, 12:10 PM
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reidnez reidnez is offline
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Yea I saw I typed that after I posted it, I meant to say the lower marked as 5.56 but even than a .223 lower should do fine.
Assuming it's an AR15 lower and not an AR10, it doesn't matter what the marking says. Lots of lowers are simply marked "multi." Heck, you could have a custom lower that says "35mm" on it. Doesn't matter.
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Old 10-15-2009, 12:15 PM
Rockhound Rockhound is offline
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Thanks, this all really helps. I get my lower in nine more days and will post some pics after the AR is built.

So far I have CMMG lower, Rock River match grade lower kit, and Magpul Mil spec stock. I'm thinking about a Yankee Hill upper. Also like the Mako T-Pod for the front grip.
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Old 10-15-2009, 12:44 PM
johnrunner89 johnrunner89 is offline
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Quote:
Originally Posted by reidnez View Post
Assuming it's an AR15 lower and not an AR10, it doesn't matter what the marking says. Lots of lowers are simply marked "multi." Heck, you could have a custom lower that says "35mm" on it. Doesn't matter.
Yup. Nice thing about a standard lower is that you can put so many types of uppers on them.
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