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Posted: 10/31/2006 5:10:04 PM EDT
Hey all, I'm all ready to get a upper on my first ar15.  I see many parts are inner changable between 5.56 and .223, Now what is the deal with the two calibers.  Is .223 and 5.56 inner changeable?  I know a few calibers are 9mm Parabellum (never even made anymore at least in high quanities) and 9mm Luger work together etc.  I know .223 is american caliber, and 5.56 is metric code.  


                             TRapture
Link Posted: 10/31/2006 6:14:05 PM EDT
[#1]
the .223 and 5.56 are the same thing ...

I had the same issue until I learned that its the same measurement..so i wouldnt worry about it ...

Folks, if you say Im wrong, Correct me anytime :)
Link Posted: 11/1/2006 1:09:59 AM EDT
[#2]
the way i understand it is.
you can fire .223 in a 5.56 chamber.
but you shouldnt fire 5.56 in a .223 chamber.
Link Posted: 11/1/2006 1:21:23 AM EDT
[#3]

Quoted:
the way i understand it is.
you can fire .223 in a 5.56 chamber.
but you shouldnt fire 5.56 in a .223 chamber.


That is correct.  5.56 in a .223 chamber is bad juju, but the other way around is fine.

Link Posted: 11/1/2006 6:20:27 AM EDT
[#4]
If I understand correctly, there are some minor size differences around the neck, and 5.56 is higher (potentially) pressure.  There may be other parts not dealing with the chamber where it doesn't matter.  Like if someone said ar15 .223 20 round magazine, no problem.
Link Posted: 11/1/2006 9:41:13 AM EDT
[#5]
That is what makes the "Wylde" chamber from Rock River and some others a good deal, you can shoot both .223 and NATO 5.56
Link Posted: 11/1/2006 10:15:58 AM EDT
[#6]
height=8
Quoted:
That is what makes the "Wylde" chamber from Rock River and some others a good deal, you can shoot both .223 and NATO 5.56 but you can shoot both in a nato chambered ar correct?
Link Posted: 11/1/2006 12:19:56 PM EDT
[#7]
yes
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