Ade Advanced Optics RD2-005 Ratchet 1x23x34 Digital Tactical 4 Reticle Green and Red Dot Sight with QD Mount, Black Unlimited field-of viewTactical Green and Red Dot SightNo need to rezero when remounting the dismounted sightFour Kinds of Reticle; Low power consumption for long battery lifeDesign for Real Fire Caliber