Need help identifying this Mauser

[UNPROFOR1994]

Anyway to accurately date it to date of manufacture?
Did the Poles make it, are is it originally german?

I think it is a Polish KBK Wz. 98 carbine, an almost identical copy of the the WW1 German Kar. 98AZ carbine, made at PFK Warsaw or FB Radom some where between 1925 and 1931. I can't narrow it down any more, maybe one of the other members can.

Any guesses on its value?

Start searching the web, the anwser is out there.

Most importantly, can I shoot regular current commercial 8mm in it?

Yes, but before you do, have gunsmith check the weapon, just to be safe.