Sighttron’s SIII Competition Riflescope series are built from the ground up for the decerning competition shooter. These fixed magnification optics are available in 36x45 and 45x45 magnification ranges as well as fine crosshair and .1 MOA Dot Crosshairs. All models in the SIII Competition family are equipped with Sighttron’s ExacTrack W& E System that provides proper alignment between the adjustments and the erector tube by maintaining the same constant and accurate point of pressure at zero or extreme adjustments, resulting in zero drift. The large oversized tactical knobs are easy to adjust in any weather conditions and are resettable to zero. The new internal zero-stop mechanism provides a tactile and audible positive stop for dead-on zero setting. Like all of Sighttron’s optics, the SIII Competition scopes feature an exclusive optical design to reduce chromatic aberrations, improve color accuracy, and deliver excellent light transmission. Optical quality is further enhanced with the Zact-7 Revcoat Plus – a multi-coating process that is applied to both surfaces of the lens for maximum anti-reflection performance and the highest light transmission. Features of the SIII Competition Riflescopes: Available in 36x45 and 45x45 magnification ranges as well as fine crosshair and .1 MOA Dot Crosshairs ExacTrack W& E System – eliminates drift Exclusive Optical Design – minimal chromatic aberrations, improve color accuracy, deliver excellent light transmission Zact-7 Revcoat Plus – lens coating technology applied to both surfaces of the lens for maximum anti-reflection performance and the highest light transmission Sightron SIII 45x45ED Fine Cross Hair Riflescope 25184