Geez, I'm trying to work...
http://w w w.gunsworld.com/spain/cetmefr8_us.html
Is it safe to shoot a 7'62x51 NATO cartridge in a FR-8?
All the sources we've asked said the same: Of course. The FR-8 has a CETME "C" barrel, designed to withstand the presures of the 7'62x51 NATO cartridge (although it's true that the CETME "A" was designed to fire the 7'62x51 CETME, with lesser power), and the locking system of the 1943 rifle (Mauser 1898) designed to withstand the even greater pressures of the 7'92 cartridge.
TECHNICAL SPECIFICATIONS:
Designation: FR-8
Origin: Spain
Cartridge: 7'62x51 NATO (.308 Win)
Overall length: 38 5/8"
Barrel length: 17 3/4"
Barrel length with flash hider: 19"
Barrel rifling: 4, dextrosum
Weight: 3,620 Kg (7 lb, 6oz)
Firing system: Mauser system
Magazine capacity: 5 cartridges
Sighting system: Regulable both windage and elevation
Radius between sights: 18 1/8"
Muzzle velocity: 2,700 fps
Main characteristics:
Flash hider / muzzle brake
Bayonet mount
Cleaning kit in a tube under the barrel
Mixed sight: Diopter and V
Able to fire rifle grenades developed for the CETME "C"