Anderson Complete Open Trigger Assembled Lower. This includes Lower Parts Kit installed and Magpul 6 position Butt Stock assembly and Magpul Pistol grip. The perfect receiver to allow you to drop on an upper, push the pins, and head to the range. Great Anderson quality.  The perfect platform for building the ultimate, mission-specific, AR-15 rifle or carbine. Made from a high-strength, 7075 T6 aluminum forging for reliable performance and outstanding durability. Mil-Spec, hard anodized finish adds extra strength to the receiver walls and delivers superior abrasion-resistance for rugged field use. Precision-machined to ensure drop-in installation of Mil-Spec, aftermarket components. This complete lower utilizes the Anderson Manuf. lower receiver with an Anderson Lower Parts Kit and is completed with a Magpul 6 position adjustable butt stock, and Magpul pistol grip.