Sightmark 3x Tactical Magnifier STS SM19024 is a Sightmark red dot sight accessory inspired by the U.S. military and law enforcement agencies. The Sightmark 3x Red Dot Sight Magnifier works in conjunction with any red dot sight to add medium range versatility to any weapon. This red dot sight accessory allows you to accurately hit targets at up to 100 yards and acquire targets quickly at up to 200 yards. High quality multi-coated optics allow you to see targets with absolute clarity, and the magnifier's 55mm eye relief makes for comfortable shooting. In addition, this tactical magnifier comes with the sightmark Slide-to-Side Weaver Mount, which allows you to flip the Sightmark Tactical Magnifier to the side so you can use the 1x magnification of your chosen Sightmark red dot sight. Plus, the Sightmark 3x Magnifier is waterproof, fog proof, shatterproof, and lightweight, making it a convenient and durable boon to your weapon.