Sig Tango MSR 1-6X24 300MM SFP BDC6 Designed for today’s common MSR / AR and bolt action platforms this scope is the ideal solution for CQB / mid-range tactical engagements 3 Gun competitions and hunting. - HellFire™ electronic-illuminated reticle system using advanced fiber-optic technology to vary the light intensity of the central aiming point in any light condition - HDX™ optics extra-low dispersion glass (LD) combined with high transmittance glass (HT) provide industry leading light transmission and optical clarity for any situation - MOTAC™ (Motion Activated Illumination) powers up when it senses motion and powers down when it does not. Provides for optimum operational safety and enhanced battery life - Dependable waterproof (IPX-7 rated for complete immersion up to 1 meter) and fog-proof performance - LockDown™ Zero System on the TANGO6 features a resettable zero zero-stop and is lockable at any location