Paul, is the Steyr ok now or are you still having problems?.
If you fancy a break and can get the rifle to me i would be happy to give it a good fettling to see if i can find what's wrong.....i have more than enough spares to swap out. Even a spare barrel to try if all else fails.
There'd be no charge for time and i would only expect payment for parts replaced, i wouldn't replace anything with out asking first. genuine offer mate, lets see if we can get your mojo back.