Sightmark 3x T-3 Magnifier with Locking Quick Detach Flip to Side Mount Aluminum Housing Matte Black Finish The Sightmark T-3 is designed to mount directly behind a red dot reflex sight in order to provide you with a 3x magnification extending your medium to long range engagement ability. The T-3 come with a locking quick detach flip to side mount which will perfectly mate up with any picatinny rail. This durable magnifier is constructed of aluminum and provides improved brightness and resolution from fully multi-coated optics. External windage and elevation adjustments align the reticle to the center of the T-3's point of view. Specifications and Features: Sightmark 3X T-3 Magnifier with LQD Flip to Side Mount SM19063 3x Magnification 23mm Objective 2.25" Eye Relief 43.3' Field of View at 100 Yards 30mm Tube Diameter Rated up to .308 Winchester Shockproof IP55 Water Resistant Full Multi-Coated Lens Picatinny Mount Locking Quick Detach Flip to Side Mount Locking, quick detach mount for quick and easy removal Flip-to-side mount provides rapid transition between optical systems Fully multi-coated, scratch resistant External windage/elevation adjustment for reticle alignment Increases magnification of accompanying sights for greater engagement range EOTech and Aimpoint compatible Overall Length 4" Overall Width 2.6" Overall Height 1.67" Overall Weight 10.6oz Aluminum Housing Matte Black Finish