Lithgowicon actions had the cut off slot cut up until WW2 but not in all actions. When the * is barred out the cut off was reinstalled but that was all no other MK3 mods. Leave the rifle as is that's how it left service. The parts from different FTR or FR are the rifles history changing them is BUBBA at work .DO NOT sand the butt this will remove the markings which tell the rifles life history. Remove the Butt before taking the forend off this only needs to be done if the draws need work other wise just leave the rifle alone apart from cleaning and oiling with BLOicon.