It's been a while since I've owned one, but as I recall you simply turn the nose of the bolt. It disconnects and you can then pull it forward from the body. I could be wrong about that, like I said it's been a while.
I also remember someone telling me that a particular Mossberg magazine will fit with very minor modifications. I'd suggest Google searching using Mossberg and TOZ as keywords.
That's a very different bolt from what was in my rifle.. The one I had was a TOZ-17-01, which may have been an earlier or later version of the rifle.
Very accurate, but crudely manufactured, would be the best way to describe mine.
Tried it and Nope. 802 is not as thick and has round front vs squared off on Toz.
Butchered 802 mag for sale.