The Sig Sauer Romeo-MSR Gen 2 is a 1x20mm red dot sight built for the modern sporting rifle (MSR / AR-15 platform). It ships with a see-through, lightweight absolute co-witness riser for a Picatinny (M1913) rail - remove the riser to drop the optic to a lower mounting height. Features: 1x magnification, 20mm objective, parallax-free 2 MOA green dot reticle 12 brightness settings (10 daylight + 2 night-vision compatible) MOTAC motion-activated illumination - wakes on movement, powers down when idle CR2032 battery with long runtime via MOTAC IPX7 waterproof and fog-proof Includes a removable Picatinny absolute co-witness riser mount A drop-on red dot for AR-15 / MSR rifles - the included riser sets the dot at AR absolute co-witness height out of the box, or mount low without it.