30mm 5.4 ounces, 1.57 high, 0 MOA, 7075-T6 aluminum with tool-less rail attachment and leveling screw. Lifetime warranty on these things and they mount up so fast with no fussing around trying to get your reticle aligned. It's not cheap, but its one of, if not the, best. These things are $400 brand new. Asking $295 Shipped FREE.
