The Barska AW11143 AR Riser Mount is custom designed to fit AR-15 rifles. This mount raises the mounting platform by 1/2 so that you can attach a scope or optic accessory with ease. It features slots that aid in scope ring adjustments. A peep sight see-through design allows you to use rifle's iron sight. Furthermore the easy-to-use thumb lock nuts assist in quick installation. - Features: - Adds 1/2 to Mounting Platform - Standard Picatinny Rail - 5.2 in Length - Peep Sight See-Through Design - High Quality T6 Aluminum