My experience with LC Smith forend that was not tight was to get tip of J spring built up with a little weld and then smooth the weld and file until forend snapped on tightly and stayed on. On LC Smith forend irons they can get bent slightly and not stay on. I straighten them by laying on a flat piece of steel and tap lightly with nylon head hammer and that will correct problem. Know nothing about Remingtons but maybe some of this might help. Bobby