Use this cantilever mount for mounting 1-inch telescopic sights onto flattop style AR-15 rifles. The offset of this cantilever mount positions the scope in a forward location, allowing the correct eye relief and head placement on an AR-15. Aluminum construction. Available Vortex Sport Cantilever 1-Inch Mount MPN Height Offset CM-102 1.59" 2-Inch CM-103 1.59" 3-Inch Learn More About Vortex Sport Cantilever mount Vortex Cantilever 1-Inch Tube Ring Mount w/ 2" Offset CM-102