The Warne Vapor cantilever MSR mount is perfect for someone looking to get an affordable US-made one-piece scope mount for their MSR AR-style rifle. The cantilever design gives you the eye relief you need for modern rifle scopes and is a perfect scope mount for a low-power variable optic. Best US made AR15 scope mount on the market. AFFORDABLE, MADE IN USA QUALITY the Warne Vapor line of mounts was developed and engineered to provide you with a solid and economical mounting solution that outperforms other mounts in their class. Scope Mount fits: AR-15, M-4, SR-25, LR308, PTR-91, and any other MSR with a Picatinny rail that is at least 2.75 inches long. For scopes with 1 inch tube diameter. Slide on Design Easy to install Field proven performance Lightweight aluminum Lifetime warranty Designed and Made in USA Specifications