Hi everyone, I have an FX Royale .22 and I have a friend who is selling a 500mm STX liner. I don't know if it's possible to put this liner on Royale, thanks in advance for all your help.
Your solid ST Royale barrel is better than any liner they make for shooting pellets. If you want to shoot slugs, you might consider another rifle, and keep that great Royale as is.
The Original Smooth Twist barrels on the Bobcat/Royale/Boss are a different animal from the STX barrels. Pellets only but second to none in pellet accuracy! As Centercut said, it CAN be done but not without some major machining & mod work.