110 SASS Actual pits top closed emitter red dot sights for pistols against each other in a gruelling durability and performance test. From mud and water to recoil and reticle clarity, these sights, including the Aimpoint ACRO P2, Trijicon RMR, Steiner MPS, and Holosun 509T, face off on Glock, Nighthawk, and other platforms to determine the ultimate pistol optic champion.