GunBlue490 authoritatively answers two of the most commonly asked questions: "Can the 5.56 NATO be safely fired in a civilian .223 Remington chamber? Can a 5.56 NATO be safely fired in a Ruger Ranch Rifle marked .223 Rem.?" In this short video, GunBlue answers each of these questions, once and for all, and explains why. GunBlue is a certified, skilled, and factory trained armorer for Ruger, S&W, and Remington, a certified, experienced NRA Police Firearms Instructor, Distinguished Expert, and has spent over 40 years teaching firearms to both police and civilians. You must watch this video if you own one of these rifles. This video may save your gun and your life!