The UTG® OP3 Mini Micro is a miniature reflex sight designed to supplement the current and oncoming wave of optics-ready, single stack, compact carry pistols that are becoming quite popular in the market. Its diminutive size and weight practically goes unnoticed on such compact carry pistols, but on the contrary, provides significant and quite noticeable benefits to the user. The Mini Micro uses a quick to acquire 3.0 MOA green or red single dot (depending on the model) with a 1-year/20,000+ Hrs or 2-year/30,000+ Hrs battery life respectively off a single CR2032 battery. The reflex set is also IPX7 waterproof rated, made from 6061-T6 aluminum, and finished in a matte black anodization. Users will be quick to notice that there are no external switches or buttons on the main body. Simply put, the Mini Micro remains constantly on at all times. An automatic brightness adjustment sensor, within seconds, corrects the single dot’s brightness intensity based on the surrounding light that is available. The UTG® Mini Micro is compatible with optics-ready pistol systems or slides that have been milled with the common JP footprint.