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View Full Version : Is my ar-15 barrel in 5.56 or .223???


IMC87
04-19-2009, 9:03 AM
Trying to be sure, i've taken off the handguard and the only markings on the barrel are

"M1S" and "1/9"

Obviously meaning "model 1 sales" and "1/9 twist"

Is there a different way to tell? IIRC .223 out of a 5.56 is ok, but 5.56 out of a .223 is bad right?

I've yet to shoot 5.56 out of her, but if the need be well with ammo availability and all it all comes down to what i can get my hands on, how can i tell what my barrel is made for? Info please :p

Tony.
04-19-2009, 9:09 AM
A barrel should have it stamped what it is chambered for. If you want to be safe about it, just shoot .223.

IMC87
04-19-2009, 9:10 AM
thats what my original thought was, on my last build the barrel was stamped with 5.56

Was i right? .223 out of 5.56 ok, 5.56 out of .223 bad?

mala in se
04-19-2009, 9:43 AM
thats what my original thought was, on my last build the barrel was stamped with 5.56

Was i right? .223 out of 5.56 ok, 5.56 out of .223 bad?

that has always been my understanding and when i built my AR i made damn sure my barrel said that prior to purchase.

IMC87
04-19-2009, 9:56 AM
that has always been my understanding and when i built my AR i made damn sure my barrel said that prior to purchase.

but its different when you order the upper online from out of state and are forced to wait for a month until you actually see the darn thing :(
It was an impulse buy, i jumped on the deal when the place said "we have one pistol upper left" so i bought a whole ar pistol :rolleyes:

joelogic
04-19-2009, 9:58 AM
Thats correct. Anyway 5.56 is hard to come by these days. The other day at the gun show it was $479 for 5.56 and $429 for .223.

IMC87
04-19-2009, 10:01 AM
Thats correct. Anyway 5.56 is hard to come by these days. The other day at the gun show it was $479 for 5.56 and $429 for .223.

The main reason i ask is becuase i was at AmmoBros the other day, i was going to buy their deal of 250rnds of .223 for appx $120, but they were all out. Instead they had 250rnds of 5.56 for the same price. I almost bought that instead... That's why im trying to be sure what mine is rated for. I will call Model 1 Sales when they are open on monday...

battleship
04-19-2009, 10:03 AM
So if you have a sig 556, what should you be shooting out of her, both perhaps?

97F1504RAD
04-19-2009, 11:01 AM
Check the end of the barrel topside just in front of the site. Or maybe you could go to http://www.model1sales.com/ and check the barrle specs on the barrel you have.

IMC87
04-19-2009, 11:16 AM
Check the end of the barrel topside just in front of the site. Or maybe you could go to http://www.model1sales.com/ and check the barrle specs on the barrel you have.

Thats where i looked, says "M1S" and "1/9". Checked their website, shows that they offer the same barrel i have in .223 and 5.56.