The OSIGHT SE Reflex Sight delivers precision aiming with a 2 MOA green dot reticle and ultra-compact design measuring just 1.59 inches in length.OSIGHT SE Reflex Green Dot Sight2 MOA dot size for precise target acquisitionShield/RMSC optic footprint and mounting systemCompact 1.59" length and lightweight 0.97 oz design21mm front lens diameterBlack matte finishCR1620 battery powered1x magnificationIdeal for pistols and compact firearms requiring a low-profile sighting solution with reliable performance and easy installation on RMSC-compatible slides.