Originally Posted by
sevin8nin
The barrel will be stamped for caliber. If it's stamped for 5.56 NATO shoot whichever you like.
If it's stamped for .223. Shoot .223 only.
This is correct. Just to further educate the OP. The barrel marking refers to what the barrel's chamber is set up for. While .223 and 5.56 are the same size round, 5.56 fires at a higher pressure and therefore requires a slightly larger chamber.
-TS
S/F,
Daryl
"To know yet to think that one does not know is best;
Not to know yet to think that one knows will lead to difficulty."--Lao Tzu
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