Advanced ergonomic shape improves the feel and handling of your MPX Easy no gunsmith installation Width 2.06 inches/ OAL height 2.6 inches/Internal Diameter 1.8 inches Lightweight rugged construction of 6061 aluminum, hard coat anodized for a lifetime of service Heat treated 4140 retaining clip with phosphate finish Includes one five slot M-Lok compatible rail section Patent pending 100% Made in the U.S.A., MI Lifetime Warranty Installed Weight