Holosun HS503R Microdot red dot sight
Holosun HS503R — rotary simplicity, hard‑use performance, zero drama
The HS503R is the “set it and forget it” micro green/red‑dot from Holosun built around a sealed rotary dial. No nested menus, no hunting for tiny buttons—just a tactile knob that clicks through brightness and off positions fast, even with gloves. For hunters, airsoft players, and tactical shooters who need a dependable sight that stays on target and holds zero through recoil, weather, and travel, this is a workhorse with real field manners.
What stands out in real use
Rotary brightness dial: positive detents, quick index from NV-compatible lows to daylight‑bright. Easy to operate under stress, rain, or cold.
Multi-Reticle System (MRS): toggle between a fine 2 MOA dot for precision holds or a 65 MOA circle‑dot for speed in cluttered backgrounds.
Long battery life + shake‑awake: CR2032 with up to 50,000 hours on practical settings; motion sensing sleeps when idle and wakes instantly.
Crisp glass, clean edges: the reticle stays sharp without flare, letting both-eyes-open shooting feel natural from 0 to 100 meters.
Solid mounts included: out of the box fit for AR carbines, shotguns, PCC, and airsoft platforms—no extra shopping to get shooting.
Why experienced users pick the HS503R
Fast target acquisition in low light or dense timber with the circle‑dot, plus precise 2 MOA dot for small vitals or partial targets.
Rugged, sealed housing that shrugs off rain, dust, and knocks; keeps working after long rides and hard recoil.
Simple zeroing with 0.5 MOA adjustments that track and hold; no wandering zero between sessions.
Low maintenance ownership: rare battery changes, minimal lens care, controls that don’t fail when wet or muddy.
Installation and zero tips
Mounting: use the included low or co‑witness mount as needed. Apply blue thread locker to rail screws and torque to spec. Re‑check after first range session.
Initial zero: get on paper at 25 m, confirm at 50 m for general-purpose carbines; for shotguns with slugs, confirm at intended distance.
Maintenance: keep lens caps on when stored, blow off grit before wiping, and replace the CR2032 proactively once per season if mission‑critical.
Technical specifications Holosun HS503R
Reticle: 2 MOA dot and 65 MOA circle‑dot (MRS), selectable
Brightness settings: 10 daylight + 2 night‑vision compatible
Power: CR2032 battery, up to 50,000 hrs (dot‑only, medium)
Activation: Shake Awake (motion‑based sleep/wake), rotary dial for on/off and brightness
Adjustment: 0.5 MOA per click; ±50 MOA windage/elevation
Lens/window: approx. 20 mm objective class with multi‑coating
Housing: durable aluminum alloy, matte black finish
Waterproofing: rated for full weather exposure (IP67 class sealing)
Mounts: low mount and lower 1/3 co‑witness mount included
Dimensions/weight: compact micro footprint; lightweight for balanced handling
Practical scenarios
Driven boar or predator control: circle‑dot centers fast against brush and dark hides at dawn/dusk; dot remains visible and refined.
PCC and action shooting: fast transitions and easy tracking on steel; rotary dial lets brightness match shifting indoor/outdoor bays.
Duty/training carbine: set preferred brightness, leave staged; shake‑awake preserves battery while keeping the sight ready.
Airsoft Milsim: robust emitter and sealed body run through rain, dust, and bumps without flicker.