The 1-piece construction of the Talley Ultralight Mount features a rigid design with no joint between the scope and rifle. This eliminates the possibility of misalignment or a loose connection between the ring and base. CNC machined from 7000 series aluminum. The Ultralight Mount is the lightest mount made by Talley, weighing in at less than 2 ounces per pair. Height (from top of receiver to bottom of scope tube):Low: Front- 0.4", Rear- 0.51"Medium: Front- 0.5", Rear- 0.61"