Sig Sauer ROMEO-RS Pro, Red Dot Sight, 31mm Objective, 3 MOA Red Dot, Matte Finish, Black SOR02030 The ROMEO-RS Pro (Reinforced Steel) was specifically engineered to provide the accuracy and convenience of a pistol-mounted red dot at a cost that competes with high-end iron sights. Inspired by the design of modern striker-fired pistols that employ high-strength polymer and metal, the ROMEO-RS Pro housing forms around a rugged steel chassis that supports and protects a premium aspherical glass lens.