Overall, the Holosun HS403B will perform exactly as expected with its 2 MOA dot, 12 illumination settings, and Shake Awake technology. It’s performance in the field confirms the motion sensor is reliable, the build quality is impenetrable, and its button operation is effortless. In my hands-on field testing of the HS403B, Shake Awake was at the top...

Shake Awake

The Holosun HS403 is one of the only red dot sights in the market under $150 with Shake Awake technology. It senses motion and will activate the red dot instantaneously before the rifle is positioned for shooting. After a period of time of non-motion, the sight will enter Sleep Mode. This is a feature many in the tactical professions will appreciate. That not only their rifles are loaded and ready, but their optics are too. LEOs, security personnel, and even armed civilians choosing to make p...

Turret Quality

Overall, the Holosun HS403B has very tactile and audible 0.5 MOA turrets that track accurately. The caps serve as the adjustment tool though another multi-tool is included in the box for this convenience. A small detail that I appreciated is that the turrets caps themselves are not recessed into the body, so it’s easier to grab and twist off. I could hear the clicks over ear protection at the range. Though they are not referenced with arrows or letters to indicate UP and R (anti-clockwise), i...

Build Quality

Battery Tray Compartment

The HS403B red dot sight has a battery tray held secure via two tiny screws. It takes a CR2032 battery that requires the positive side to be faced down. The tray design ensures consistent connection, side-mounting convenience, and it eliminates the bulk of a knob compartment. Though it’s just a different battery compartment design, it works, and it shaves off some protruding bulk, I hate it. The mini screws are tedious to deal with. It took me longer than I think is necessary. Do not lose the...