PCO – Red Dot Pistol Optic: When we designed the Pistol Combat Optic, we gave it everything we wanted to see in a red dot. Say Hello to the PCO. Outside, it has a big window for easy target acquisition, a 3 MOA red dot, a top load battery compartment, and a co-witness channel. Inside you’ll find a 1632 battery, four minute auto stand-by, and the instantaneous “shake-awake” feature. The PCO sits on an RMR footprint, making it compatible with most factory cut slides. The PCO also comes with a picatinny rail attachment to make it even more versatile. This little red dot is as tough as they come and will perform in the clutch on your carry or duty weapon.