Your rifle was a Mauser K98K manufactured in 1944 by the Third Reich. Specifically, the receiver was made at Radom for Steyr. But, beyond that, the rifle is in what we call "Russian Capture" configuration. Meaning that it's a mixmaster of different parts that the Russians slammed together after the fact. These rifles typically operate just fine, but they aren't nearly as collectible as an untouched matching example.
I hope this information was helpful to you.
- Chris