The Sig Sauer ROMEO4T-PRO Ballistic Circle Dot 1/2MOA FDE Reflex Sight w/Hex Bolt Mount & Spacer SOR44102 is a tactical red dot sight designed for professional use. Featuring a Ballistic Circle Dot reticle with 1/2 MOA adjustments, this sight offers precise targeting for short and medium-range engagements. The durable half-inch hex mount and spacer provide versatile mounting options, while the engineered lens coatings ensure elite performance in bright light or night vision conditions. With 9 daytime settings and 3 night vision settings, the ROMEO4T-PRO delivers reliable performance in various lighting environments. The sight includes clear flip-back covers, an opaque front flip-back cover, and an ARD Kill-Flash, making it ideal for demanding applications.