I HAVE AN ALUMINUM RECIEVER SPRINGFIELD SAR-8 WITH THE GREEEN FURNITURE. I READ IN THE BLUE BOOK THAT THIS IS THE LAW ENFORCEMENT VERSION. WHATEVER THAT MEANS. ANYWAY, ON THE SEAR PACK IT HAS "SAFE" MARKED WITH AN "S", "FIRE" MARKED WITH AN "E" AND THEN IT HAS A THIRD POSITION MARKED WITH AN "F". THE ONLY PROBLEM IS IS THAT THERE IS A PIECE OF METAL BLOCKING THE SELECTOR SWITCH FROM MOVING INTO THAT THIRD POSITION. IS THIS ONE OF THE BIGGEST ATF LOOPHOLES OR IS IT JUST THERE FOR LOOKS? ANY THOUGHTS WOULD BE GREATLY APPRECIATED. THANK YOU.