Compact accessory rail clamps directly to scope tube to provide mounting space for holographic sights, lasers, IR illuminators, flashlights, and other accessories that fit Picatinny style rails. Increases accessory mounting options, without restricting your scope base and ring options. Short enough not to interfere with rings, turret, or scope objective, yet provides adequate rail length to accept a wide variety of devices. Rail mounts at any angle on the scope tube and positions alternate sight close to the scope axis, so switching between main and secondary sights requires minimal head movement. Made of lightweight, precision machined aluminum and hardcoat anodized for added strength to withstand the pounding of recoil without losing adjustment. Specifications: Designed To Work With All Scope objective Lens, 56mm Or Larger CNC Machined, 6061 Aircraft Grade Aluminum Type 2 Class III Hard coat Anodized Rock Solid, Will Hold Zero Even With .50BMG Picatinny Rail: 1.50" Long w/3 Slots Lightweight, Only 1oz 100% USA Made