Designed to aesthetically match MEGA billet upper receivers, the MEGA GTR-3H Ambidextrous Billet Lower Receiver comes stripped and ready for your next custom AR build. ZEV starts with high-quality 7075T6 billet aluminum and machines them to exceed mil-spec dimensions held to ±.001″ tolerances, giving you maximum compatibility with mil-spec and aftermarket parts and accessories. The MEGA GTR-3H Ambidextrous Billet Lower Receiver offers superb strength and versatility for building an AR-15 configured exactly the way you want it.