Upgrade you long range shooting setup with MDT’s Premier Scope Rings. These rings are available in numerous heights and the majority of common tube sizes. To ensure ultimate strength and precision, the Premier Scope Rings are CMM checked to 1.5 millionths of an inch, and are precision machined from a solid billet of 6061 aluminum. One of their more notable features is a STANAG 4694 specification, aka NATO Spec. Unlike MIL-STD-1913 rings that leave a small gap between the rail and underside of the mount, the Premier Rings tightly sit on the top of the scope base rail, with pressure being applied to the underside of the angled rail surfaces to maintain a solid interface. Features of the MDT Premier Scope Rings: Machined from solid aluminum billetCMM checked to 1.5 millionths of an inchSTANAG 4694 specification MDT Premier 30mm 0.820" Low Blk Scope Rings 103346-BLK