[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

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[ARCHIVED THREAD] - Barrel caliber Identification help

[ARCHIVED THREAD] - Barrel caliber Identification help