The BSA 30mm Red Dot is a simple, durable, both-eyes-open optic for fast target acquisition on rifles, shotguns, and handguns. Key Features 30mm tube with a crisp 5 MOA red dot Multiple brightness settings for any lighting condition Unlimited eye relief and parallax-free aiming Shockproof, weather-resistant aluminum housing Fitment Mounts to any Weaver / Picatinny rail (sold separately if not included).