The Midwest Industries QD Optic Mount for Trijicon ACOG and VCOG models is precision machined for optimum return to zero performance and reliability. Made of hard coat 6061 aluminum it is sure to last you a lifetime. Backed by Midwest Industries Lifetime Warranty. FeaturesSuperior clamping that will no damage or coin the rail surfaceExtremely smooth in operation with a multi-faceted adjustment nut to get the exact tension required by the operatorFully adjustable with no tools required, can be adjusted to fit rails not machined to mil-spec tolerances.Weighs only 2.4 oz.Precision machined for optimum return to zero performance and reliabilityHard coat anodized 6061 aluminum for a lifetime of servicePatented QD lever by Elite Defense Midwest Industries Lifetime Warranty