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Posted: 10/19/2004 7:51:28 PM EDT
[Last Edit: 10/19/2004 7:52:03 PM EDT by DreamWeaver88]
I bought the upper for my first AR at a gun show. The upper is marked "LK" which is from FN or Kaiser, according to the info found on this site.

My question is, how can I tell if I am able to fire 5.56 out of the barrel. The barrel has no markings on it at all.


Link Posted: 10/19/2004 7:57:00 PM EDT
Just shoot it... and examine fire cases for signs of flattened primers. Way I see it, if it is reliable, you are good to go. I fired many a 5.56 round out of a .223 SAAMI chamber with little issue. Occasional stuck case or popped primers will tell you if you can live with it or not.
Link Posted: 10/20/2004 1:23:37 PM EDT
Thanks for the info. I guess I'll try that and see how it goes.

BTW, what's the worst that can happen if I fire some 5.56 and it turns out to be a .223 barrel? Could it blow up the rifle?


Link Posted: 10/20/2004 4:03:53 PM EDT
No, you are not going to blow up your rifle. I have never heard of a case. I have heard lots of forum talk, but no proof.

The SAAMI warning is very general, it does not specifically say it is dangerous to fire 5.56 thru your .223 AR-15. The SAAMI specs are based on worst case, lowest common denominator.

I have also fired lots of 5.56 thru .223 barrels. No problems.

FALARAK and I are in full agreement on this.
Link Posted: 10/20/2004 4:08:16 PM EDT
Great. Thanks a lot for the info, guys!

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