Originally Posted by JEV
The silver port is now fitted at the factory to conform to UK requirements that the gun cannot be adjusted over 12 ft/lb.
It's worth pointing out that the only U.K. requirement is that the rifle must not be "Capable" of more than 12 FPE. Steyr do not believe that AT should be fitted as it stops you stripping/cleaning your rifle and keeping within the law.There is also a restriction on the hammer spring setting as well as the reduced size transfer port.
Other manufacturers decided to fit AT so your rifle is only factory adjustable and you run the risk of having an over power rifle on your hands.