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  #1  
Old 12-17-2016, 12:23 PM
Jrod4529 Jrod4529 is offline
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223 or 556 223 or 556 223 or 556 223 or 556 223 or 556  
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Forgive my ignorance of this topic. I have recently purchased my first AR. I got the MP II sport. Is this rifle able to shoot 556 and 223 or just 223?
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Old 12-17-2016, 12:25 PM
purplepack purplepack is offline
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Short answer, Both!!
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Old 12-17-2016, 12:26 PM
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Mark IV Mark IV is offline
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You're fine. A rifle chambered in 5.56 will safely fire both rounds. With most rifles chambered in .223 it's not recommended you fire 5.56 in it (the CZ bolt action .223's are one exception I know of.)
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Old 12-17-2016, 12:38 PM
cyphertext cyphertext is offline
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What does your manual say? You have read the manual, haven't you?
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Old 12-17-2016, 12:40 PM
Jrod4529 Jrod4529 is offline
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What does your manual say? You have read the manual, haven't you?
Ha ha I have it on order won't receive it until Monday or Tuesday. I'm just impatient and excited.
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Old 12-17-2016, 12:41 PM
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If the barrel is marked for a 556 you can shoot both 223 or 556 through the rifle.
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Old 12-17-2016, 12:42 PM
cyphertext cyphertext is offline
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Ha ha I have it on order won't receive it until Monday or Tuesday. I'm just impatient and excited.
Enjoy!

https://snwcdnprod.azureedge.net/sit...005747_web.pdf
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Old 12-17-2016, 12:46 PM
apollo99 apollo99 is offline
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cyphertext makes a good point about reading the manual, I say also take another step and look at the barrel, it should be marked .223 or 5.56 Nato. The difference is in the throating of the barrel, and sometimes in the degree of looseness in the chamber. The 5.56 nato chambers are a tad looser, and the rifling starts a little further down the bore be able to chamber a variety of nato rounds. The nato rounds are also usually loaded to higher pressures than .223. Most but not all AR-15 are chambered in 5.56 these days, but as I said check the barrel markings to be 100% positive
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Old 12-17-2016, 01:19 PM
cyphertext cyphertext is offline
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Originally Posted by apollo99 View Post
cyphertext makes a good point about reading the manual, I say also take another step and look at the barrel, it should be marked .223 or 5.56 Nato. The difference is in the throating of the barrel, and sometimes in the degree of looseness in the chamber. The 5.56 nato chambers are a tad looser, and the rifling starts a little further down the bore be able to chamber a variety of nato rounds. The nato rounds are also usually loaded to higher pressures than .223. Most but not all AR-15 are chambered in 5.56 these days, but as I said check the barrel markings to be 100% positive
Agree... always look at the barrel markings, especially if buying used!
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Old 12-17-2016, 02:59 PM
arnoob arnoob is offline
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Since when do men read manuals? When I get something new I first pick it up while looking confused and expect an understanding of its operation to strike me like a bolt of lightning, if I still don't understand how it operates I then hit it repeatedly with my hand whilst making an OOOO OOO OOOO noise until it complies and the bolt strikes, if that still doesn't work well that's when I go to the basement to get my hammer...

Last edited by arnoob; 12-17-2016 at 03:00 PM.
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  #11  
Old 12-17-2016, 03:11 PM
LAA LAA is offline
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And, if a barrel is marked 223 Wylde, then it's good for both .223 & 5.56.
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Old 12-17-2016, 03:17 PM
apollo99 apollo99 is offline
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arnoob, while I understand most of you post you have to clarify some things; Is it a BFH or a LFH that you are using?
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Old 12-17-2016, 03:43 PM
cyphertext cyphertext is offline
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Quote:
Originally Posted by apollo99 View Post
arnoob, while I understand most of you post you have to clarify some things; Is it a BFH or a LFH that you are using?
BFH! Only a BFH will make things work!
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Old 12-17-2016, 11:38 PM
Racer X Racer X is offline
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For the record .223 Wylde is a tighter hybrid chamber generous enough to handle almost any NATO 5.56 rounds, but tight enough so it shoots .223 Remington loads almost as accurately as a native .223 Remington chamber. Best of both worlds.

Clearing the Caliber Confusion: .223 Wylde vs. 5.56 NATO - American Weapons Components

Last edited by Racer X; 12-22-2016 at 03:19 AM.
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