I am looking for a BRNO ZKK 602. Either a complete rifle, incomplete rifle or just an action but it must be the earlier model with the Pop-up aperture. The aperture does not have to be complete, as I have a spare one. Alternatively, a CZ 550 Magnum that has been custom fitted with the pop-up aperture would also be acceptable. I am happy to go through the process of importing the rifle from anywhere in the world and I already have a US based export agent if that is necessary.