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Posted: 4/4/2006 6:11:54 PM EDT
I have an older(1994) Colt Sporter marked .223 cal.

Is it safe to shoot 5.56mm through a gun marked .223 cal?



Please dont flame me too hard for asking...I dont want to ruin my rifle.
Link Posted: 4/4/2006 6:43:09 PM EDT
I can't tell you for sure, but if it is not marked 556, don't shoot it, stick to 223. Someone else may be able to tell you more.
Link Posted: 4/4/2006 6:53:30 PM EDT
call Colt and ask them
Link Posted: 4/4/2006 6:55:51 PM EDT
Usually it's not recommended because of the tight chamber on the .223 and the higher pressure differences with the 5.56mm. It's not worth the chance of a KB.

5.56mm is fine to shoot .223 and 5.56mm through, but .223 should be .223 only.
Link Posted: 4/4/2006 7:35:19 PM EDT
Ammo forum
www.ar15.com/forums/forum.html?b=3&f=16

AR15.COM AMMO ORACLE
www.ammo-oracle.com/

You'll get your questions answered there in the first two or three tacked posts....
Link Posted: 4/4/2006 8:37:07 PM EDT
[Last Edit: 4/4/2006 8:41:44 PM EDT by flatfender]
Check the barrel markings. If it's the original Colt barrel it'll say C MP 5.56 NATO and some kind of twist rate (1/7, 1/9). I don't know of ANY original Colt ARs barrels that are not 5.56 chambered, no matter what the lower says.
Link Posted: 4/4/2006 10:37:20 PM EDT

Originally Posted By flatfender:
Check the barrel markings. If it's the original Colt barrel it'll say C MP 5.56 NATO and some kind of twist rate (1/7, 1/9). I don't know of ANY original Colt ARs barrels that are not 5.56 chambered, no matter what the lower says.



Thank You, that is what it says.


Makes me feel stupid.
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