MasterPiece Arms MPA BA Mount features a 30mm tube diameter and 1.125 mount height with 0 MOA cant. Made from Black 6061-T6 aluminum with a Type III Mil-Spec anodized finish, this 4.76 long 1-piece mount weighs 6.80 oz with integrated rings. It mounts to MIL-STD-1913 Picatinny rails via a cross-bolt screw clamp. Designed for precision bolt-action rifles, this height is categorized as Medium / High, whereas on an AR-15 platform it functions as an ultra-low mount that would block your sightline. Safety Note Always ensure the firearm is unloaded before installing or adjusting any optics or bases. Verify proper torque specifications during installation. Improper mounting may affect accuracy and safety.