The Sig Sauer Romeo-MSR Gen II 1x20mm 2 MOA Compact Green Dot Black SORMSR102 is a high-performance green dot sight optimized for MSR rifle platforms. Featuring a 2 MOA green dot emitter, this sight offers 12 brightness settings for optimal visibility in various lighting conditions. The ruggedized industrial design includes a see-through riser mount for absolute co-witness with standard iron sights. Powered by a CR2032 battery with a 40,000-hour runtime, the ROMEO-MSR Gen II is IPX7 waterproof and fog-proof, making it ideal for demanding environments.