CYMA M4 600 Meter Flip Up Rear Sight

CYMA M4 600 Meter Flip Up Rear Sight Constructed of Full Metal Material Tactical Stand Alone Flip Up Rear Sight which is suitable for all M16 Series & AR-Series Sight is held in the locked down position by a screw release dial Utilize the same well proven concept as the rear sight on the RIS system Adjustable Top to Bottom, Left to Right by screwing a dial 300 ~ 600 meter selection in just a second Built in horizon line feature helps lead distance targets and lets the shooter square the rifle to counter windage offsets Mount on standard 20mm weaver base