Warne Mfg V4002M: The 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. AFFORDABLE, Made IN USA Quality Warne\'s 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.