NP Holdover, they're actually all 3 the same rifle, the HW50S in .177 caliber. I've just tried different scopes, with and without the Beeman Universal Muzzle break, etc...
Now I have it set up with no muzzle break, sights off, rear sight screws in, Leupold 3-3x33 EFR on top with LOW 2-piece Sportsmatch mounts.