The Optics 3X magnifying module is specially designed for compatibility with holographic sights and for maximum flexibility and increased performance in the field. This magnifier is a revolutionary tool for military personnel， law enforcement， sport shooters and hunters. SpecificationsMagnification: 3X Weight:370gOptical Coating: Mgf 2 blue Rail Type: 20mm weaver rail Eye Relief: At 5o FOV 40 90 mm At full FOV 60 65 mm Package Includes: 1 x 3X Magnifier Scope 1 x QD FTS mount base2 x Allen Wrench1 x Cleaning ClothThis 3X magnifier gives you more clear and accurate sight， a very good tool to increase field performances. The specially designed flip to side tactical mount provides very quick and easy switching sights between magnifying and non-magnifying. A powerful tool to your hunting/target practice and airsoft.A perfect add-on to your red/green dot sight/ reflex sight