I have one. It is a very good plinking rifle. teh rear sight rotates to four different elevations, something like the C1A1 sight.
The front post screws in and out, to zero the sights for elevation. because the rear sight is welded in place, wind zero is done at the front. the front post is off-centre from the threaded shaft, so it moves left-right as it rotates. In this way you make a final wind zero as you set your elevation. A neat, solid system.
Rifles would be worth more if there was cheap ammo to feed them.