So a few ears ago I bought this rifle from a buddy, which was not cheap! This KK was made in the 1920's or 30's as evidence from the BUG proof marks. What is really interesting is the rear sight. As you can see it uses a clock winder key to adjust the elevation and windage. Built into this sight are 5 different rear peep hole sizes. It also has a yellow lens that is internal to cut glare in bright sunlight. The nickle tube is a small internal magnifier! You will see these for sale often on Gun Broker, but never with the original rear sight.





Oh and they are damn accurate too! 25 yards rested blade front sight.

I hadn't heard of them before.
Thats pretty cool.