Lower Receiver: Our Patent Pending lower receiver includes integrated feed ramp for reliable feeding including hollow points and integrated LBRHO (last round bolt hold open) for AR-15 bolt release functionality. LRBHO is easily removed with 3 screws for competition shooters. Huge magwell entry chamfer for way faster and easier magazine changes, no aftermarket funnel needed it is so large. TracStar™ magwell with full traction design. Designed for the operator to grip and maintain weapon control even in the most extreme conditions. Tension device to maintain rigidity between upper and lower receivers. Rear detent spring capture device to facilitate easier removal of buffer tube. Built in trigger guard eliminates the need for a flip down trigger guard. Fully CNC machined from 7075-T6 aluminum for extreme precision and enhanced durability. Skeletonized for further weight reduction.