This 30mm ERATAC One-Piece Ultralight Mount has 0 MOA. Specifications: 0 MOA Inclination 30mm Ring Diameter 0.866" / 22 mm Height to Bottom of Ring 1.457" / 37 mm Height to Centerline 78 mm Length Inside of Rings 114 mm Length to Outside of Rings 124 mm Overall Mount Length Weight 147 g / 5.19 oz With several new models released by ERATAC in 2017, Ultralight One-Piece Mounts are approximately 50% lighter than comparable sizes in ERATAC's standard line. Despite this savings in weight, these mounts are suitable for use on any bolt action or AR10-type rifle, having passed rigorous testing (including use with .50-cal. rifles). These mounts (all parts included) are manufactured to military specification. Additionally, there are no parts which can become lost through normal use. All parts are Type-III anodized (black), rendering them rust-proof Available for 30-, 34-, and 36-mm scope tubes Secures to rail via Torx screws ERA-TAC ERATAC One-Piece Ultralight Mount 30mm