Handgun owners, this ADE green dot sight gives you that quick target acquisition you've been looking for! The RD3-006B model has some nice upgrades - the rear locking screws are gone, replaced with a self-locking mechanism that's way easier to use. The motion-activated technology is brilliant too - it goes into sleep mode after 5 minutes of inactivity, then wakes up instantly at your previous brightness setting when you move it. Saves battery life without sacrificing readiness. The 3 MOA green dot is crisp and clear, with precision-ground lenses that minimize parallax and give you a sharp sight picture. It comes with a Picatinny mounting base but also works with various handgun mounting plates that replace rear sight dovetails. Compatible with Optics Ready pistols like Glock MOS, Springfield OSP, and others. The windage and elevation adjustments are fully adjustable and lockable once you've got it zeroed in. Unlimited eye relief means you get a clear sight picture regardless of your head position. Powered by a common CR2032 battery (included), it has multiple illumination settings for different lighting conditions. The footprint matches plates made for Vortex Venom, Burris Fastfire, and other popular micro red dots. For the price, you're getting features usually found on much more expensive optics. Solid entry into the pistol red dot world without breaking the bank!