The Sightron SI 4-12X40 HHR Riflescope offers enhanced viewing power for longer-distance shooting. The construction is rugged and waterproof. It is nitrogen-filled offering internal fog protection in all weather conditions. The scope features a fast focus eyeball. A finger-adjustable windage and elevation knob makes for quickly getting the scope on zero. The rounded knurled dials complete with positive clicks provide all the precision you required. The scope provides sharp, crisp views with impeccable clarity thanks to the SIH multi-coated lenses.