It appears that you have a Steyr Mannlicher sporting rifle made in the town of Steyr, Austria. This is a rather old gunmaking firm, well known in modern times for high quality sporting rifles. Fortunately, they are still in business. With any luck Steyr may still have documents which can be researched to answer your questions.
This is the Steyr Mannlicher web address:
And this is the same address translated by babelfish: