The Leupold Mark AR bases epitomize durability and reliability, making them an essential accessory for your top rail. Engineered with 5 mounting bolts and 3 lugs, these bases ensure a rock-solid attachment, staying firmly in place even under the most demanding conditions. Precision machined from aircraft-grade aluminum, they offer incredible strength without the burden of added weight, ensuring your gear stays efficient and manageable. Leupold & Stevens, Inc., a storied American, family-owned company since 1907, brings over a century of craftsmanship to their products. Renowned for their unwavering commitment to customer satisfaction, Leupold has built its reputation by manufacturing some of the finest optics and accessories in the shooting sports market. When you choose Leupold, you choose a legacy of quality and performance that stands the test of time.