5.56×45mm NATO is specified in the manual. Details about the differences between the calibers you mentioned are heredaniel2002p wrote:This may be a stupid question but will this fire 223 and 556?
--Dan
http://blog.cheaperthandirt.com/223-vs- ... in-my-gun/" onclick="window.open(this.href);return false;
http://en.wikipedia.org/wiki/.223_Remington" onclick="window.open(this.href);return false;
I hope this answers your question.