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Discussion in 'Rifle Discussion' started by theduke, Apr 9, 2009.
On a unmarked AR barrel/upper, How do you determine if it is chambered in 223 or5.56?
bumping... I have the same question! Thanks theduke
Did you remove the handguards to see if it's marked? if not are there any marks?
:withstupid: JK I really have no idea either.
This is something we all need to know td
It's a bare barrel with absolutely no marking of any kind except a couple scratches.
Use a chamber gauge for .223 & 5.56
When in doubt only use 223 Rem.