BSA Optics TW223-618x40AOCP Tactical Weapon 223 Scope, 6-18x40mm Designed specifically for Military and Law Enforcement Applications Mil-Dot Reticle 2 Sets of Interchangeable Turret Caps (.233 Cal./.300 AAC Blackout) Composed of Aluminum two-piece body Water-Proof, Shock-Proof, Fog-Proof