Shooting .223 out of a 5.56 NATO chambered gun

[jmcrawf1]

What say you experts?

 

[spanky]

Afaik, .223 out of a 5.56 is okay, its the other way around that's not.

 

[AK shooter]

223 in a 5.56 gun is ok. 5.56 in a 223 gun not ok.

 

[George]

 

[Quas]

So in other words I should build a 5.56 upper instead of .223? Sounds good to me!

 

[nickatnite]

223 in a 5.56 gun is ok. 5.56 in a 223 gun not ok.

We are talking about the 5.56 x 45 round. Right?

 

[LAYNFRM]

well that's good to know. on some sites, it has .308 and 7.62x39 listed as the same. is this correct?

 

[Speedlace]

well that's good to know. on some sites, it has .308 and 7.62x39 listed as the same. is this correct?

No.

Should be .308 and 7.62x51/7.62NATO

 

[GunAddict]

What say you experts?

I think I was arf.com a couple of days ago following some links about this. From what I remember if it says .223 on the barrel it is unsafe to use the 5.56. Such as the mini-14 has .223 on the back side of the breach. It was noted that there can be an un-safe pressure build up from firing the 5.56 in anything chambered .223. The articles said there is a slight difference in the rounds and that the rifles chambered for 5.56 was cut or bored a little longer in the barrel(can't remember exact word). It also said that most of your name brand barrels for ar's are made to the 5.56 spec. They did name one that wasn't, but I can't remember the name. Just have to make sure before you buy the wrong one.

 

[3wbdriver]

5.56mm chambers are built to withstand a higher SAAMI pressure than .223 chambers. Better to build for that if you have an option.