[ARCHIVED THREAD] - Barrel caliber Identification help

Posted: 2/3/2009 6:44:59 AM EDT

I recently picked up a Colt 20" pencil barrel upper. It is marked CMP chrome bore on the barrel. I could find no other markings on the barrel. I know this means its a colt barrel with magnetic particle inspection. What I want to know is, is it safe to shoot 5.56 in this barrel or can it only shoot .223?

Thanks

Posted: 2/3/2009 6:52:24 AM EDT

[#1]

All military barrels were chambered for 5.56 - the .223 chambering is a civilian freakness that IIRC is usually only used for Space gun Match weapons using match ammo. Most ARs will run 5.56. Yes, you can use 5.56.

[ARCHIVED THREAD] - Barrel caliber Identification help

AR Sponsor

Win a FREE Membership!

Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!

You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.

Warning

Confirm Action

[ARCHIVED THREAD] - Barrel caliber Identification help

[ARCHIVED THREAD] - Barrel caliber Identification help