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Posted: 10/31/2009 12:59:16 PM EST

I know that if your upper is chambered for 5.56 it can shoot .223 but a .223 can't shoot 5.56 and I understand why. My question is, does the same hold true for barrels?

Thanks in advance.
Link Posted: 10/31/2009 5:26:01 PM EST
Both cartridges run a .224 bullet so the barrels are identical.
Link Posted: 10/31/2009 8:11:13 PM EST
It is the chamber part of the barrel that is at issue. The bore of the barrel is the same and the upper receiver itself is the same.
Link Posted: 11/1/2009 8:14:30 AM EST
Im sorry, I wasnt thinking right when I posted that. lesm is completely right, the barrel is what matters with the chamber issue.
Link Posted: 11/1/2009 9:28:01 AM EST
So you can't shoot 5.56 in a .223 chambered barrel?
Link Posted: 11/1/2009 12:27:22 PM EST
No, the first few inches of the barrel is the chamber. So i your barrel is chambered for .223 you cannot shoot 5.56.
Link Posted: 11/1/2009 12:46:16 PM EST
Link Posted: 11/3/2009 9:59:06 AM EST
Originally Posted By murf214:
So you can't shoot 5.56 in a .223 chambered barrel?

It is not ah, recommended. .223 chambers have a short throat that can cause the pressure to exceed the design pressure when fired using .5.56 NATO ammo.
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