The Barska 1-3x30mm IR Multi-Rail Electro Sight Riflescope is designed specifically for tactical shooters that need a versatile rifle scope for both short distance quick acquisition shooting and medium to long distance shooting. The rifle scope is designed with integrated Weaver style 7/8® Picatinny tactical rails which allow you to customize your scope with additional aiming accessories. Easily attach and use the rifle scope in combination with a laser sight, flashlight or secondary sight. Ideally use the rifle scope's external rails to attach a laser sight that is zeroed in at a short distance (50 yards) and then zero the scope reticle in at a longer distance (100 yards). This allows you to instantly shoot targets at two different distances.