I've seen bayonet lugs or sockets on sporting rifles in, IIRC, auction books. I was led to believe that they were marketed for tiger and leopard last defense. Most of the other features on this rifle, I've seen on various other W/Rs over the years except the 7 leaf sight. Gotta wonder what the range was on that bad boy!
Like others have said, neat rifle and you should buy it or give someone else the hook-up.