I bought a Spanish FR-8 a couple of years ago without a rear sight. These were converted in the 1950s into training rifles for the CETME. Along with other modifications the sights were changed to a style simular to the CETME. The rear sight is on the rear bridge and I am told it was some sort of rotating affair. Guns were imported by Century and they have no parts. I've checked the usual places to no avail. This is a great handling .308 carbine that probably deserves to be fired aimed instead of pointed! Any help is appreciated.