Ar15 223 or 5.56?

If purchased as a finished rifle, the stamps will be on the lower. If it was a built up, or of an unknown origin, you can remove the upper and bolt and carefully insert a piece of empty 223 brass and see how it fits the chamber.

The key, in any event, is knowing the history of the rifle, where you got it, who it's from, was it factory or a build up. If the origin is unknown, you can take it to a FLG (friendly local gunsmith) and have him check it out for you.

Traded for a century c15 sporter (i Know). Lower reads exactly cal: .223 (5.56mm) have only replaced upper because of slop.

I'd ask the person I traded with where he got it and what brand it is. If he can't provide the data, take it to the gunsmith.

Sorry, I bought it new. I have a stag ar stamped 5.56, so I know i'm good there.

Ah, then you're good to go, unless a total freak has happened, your upper will be ss3/5.56 without problem.

Fundamentally, the 5.56 NATO and the 223 are interchangeable.

Thank you for your time. I feel alot better about that 500 rounds I bought today. Have a great weekend.

(G). I think you'll find the AR to be so fun you'll need several thousand!

5.56 is also fire .223 because 5.56mm=.219 inches that mean that the difference between .223 and 5.56 is .004 inches . The thick of a paper sheet is .003 inch.

Formula metric to inches (any number in metric)/25.4 example 5.56/25.4=.21889.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.