Sorry if this has been asked before but need to act quick on this. I am considering buying an older AR from a guy online.

He has only shot it once and was the original owner.

He does not know if you can shoot 5.56 or just .223

The receiver is stamped .223 I tried looking this gun, up but can't seem to find anything on it. I would also like to know what twist is on the barrel.

He does not have the book for it.



Thanks

Just found out it is marked 5.56 NATO on the barrel.

What is "mid-ban?"  

probably thinking "ban era" without any evil features.

You can shoot both
 

And should be a 1-7 twist.
But it definitely isn't retro!  

Just noticed it was your second post.  Welcome to the board!  You've stumbled into the friendliest corner of the web, but we focus primarily on Vietnam-era ARs here.
Hang around, though, and we'll have you straightened out in no time!

The A2 Forum is <Thataway!

If an H Bar ,or most all Colt AR barrels for that matter,the twist rate should  be stamped on barrel, but the particular rifle you inquired about shoud be 1:7 tiwist
You can safely interchange  .223 and 5.56 which is the NATO caliber deigntion...Be advised though that there are minute differeces between a .223 ans 5.56,
I believe primarily ,if I remember correctly, in the Meplat of the case,but in the real world, the 2 caliber designations are interchangeable..This point by the way
Is constantly debated.. .223 is much more common to find commercially than 5.56 anyway,so buy .223 whenever possible
Military designated Colt AR 's (M 16 and M4's as examples) are marked ,5.56 as sporting AR's  .223

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