The aluminum Mark 4 cross-slot mount is designed to fit a Picatinny rail and any scope with a same size maintube. These mounts are machined with precision tolerances to offer superior integrity based on the proven cross-slot design. Nothing is more crucial than the link between your scope and firearm. That's why our mounts are every bit as rugged and dependable as the Leupold optics they secure. And with a huge variety of mounting systems to pick from, you're sure to find the perfect match for your firearm and style of shooting. Made in the USA and guaranteed to hold up to a lifetime of abuse, Leupold mounts will never let you down.