Posted in: .223 Remington, 5.56mm ammunition, AR-15, Backup Iron Sights (BUIS), M-4 Carbine, Optics, Zeroing Techniques. Tagged: 36/300 Meter Battle Zero, 50/220 Yard Battle Zero, Aimpoint Pro, Backup Iron Sights (BUIS), backup sights, Battle Zero BZ, Battlesight Zero, Cowitness AR-15 BUIS, eotech, How To Zero AR-15 Backup Iron Sights BUIS, How To Zero AR-15 Heads Up Weapons Sight HWS, How To Zero AR-15 Red Dot Sight RDS, loctite. Leave a comment