I have an information overload and as a result am totally confused. I have recenly purchaced the above weapon and was told by the dealer, it was safe to fire .556 in this weapon. I have done so, less than 100 rounds for zero etc.
The receiver is stamped .223. The AR comparison on this site rates Colt AR as .556/.223. Other inputs state it is dangerous to use the .556 in a .223 due to chamber pressures. Colt's web site is not very helpful at the present. Can anybody get me out of this fog? Thanks for the help