Giving an extra 20MOA of elevation adjustment for long range shots, the Warne Vapor is AFFORDABLE, MADE IN USA QUALITY. The Warn Vapor line of mounts were developed and engineered to provide you with a strong and economical mounting solution that outperforms other mounts in their class for you AR15/MSR style rifle. Fits scopes with 1 inch tubes. 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 Fits Objective size 72mm Easy to install Field proven performance Lightweight aluminum Lifetime warranty Designed and Made in USA