I was in my local gun shop this morning and looking at the Mossberg MMR Hunter (AR-15). The clerk said that it was chambered for 5.56 X 45 (NATO) only and .223 Remington could not be used. I have never heard of this before. I know that you should not use 5.56 NATO in a gun chambered for .223 but have always thought you could use .223 in any gun chambered for 5.56 NATO. What is going on here? I have checked Mossberg site as well as a couple of reviews on this rifle and none mention that it cannot be used with .223 rounds. All say 5.56 NATO/.223.
Gun store employee was mistaken (or is an IDIOT!). I would give him another chance to insure you heard him correctly. If he is, indeed, an diot, ask to speak to the manager/owner. He/she needs to know what kind of mental midgets are working there.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball