Fired the first round of the last mag that I was going to put through my new IAI M1 Carbine and the 2nd round in the mag would not load. After locking the bolt back and removing the mag I saw that the spent round was nothing more than the case rim. A check of the breech showed the rest of the case still embedded there. Range officer tried to get it out with out success. I tried when I got home with a 30 caliber rod and brush with still negative results. All suggestions would be appreciated.