Holosun 403B Micro Red Dot Sight 2 MOA - HS403B
Click to see full view
Holosun
Overview
The Holosun 403B Micro Red Dot Sight features a 2 MOA dot that provides precise aiming capabilities for various shooting applications. Designed as a red dot optic, it allows for rapid target acquisition and excellent visibility in a variety of lighting conditions. This sight is frequently found on builds featuring a pistol gas system, particularly in 5.56 NATO caliber configurations.
Specifications
Available Merchants(5)
Prices checked
Stock Alert
Log in to get notified when this product is back in stock.
Build history on GunPartPicker
Builders have been adding the Holosun 403B Micro Red Dot Sight 2 MOA - HS403B to their builds on GunPartPicker since February 2026. All time, it ranks #252 of the 481 optics builders have added. Builds with this optic are mostly chambered in 5.56 NATO (63%, then 300 Blackout 25%), nearly all on pistol-length gas, and mostly AR-15 (90%, then AR-9 10%).
It was out of stock everywhere we track for all of August 2026, and today none of the 5 retailers we track has it in stock right now. Listed prices start at $112.49 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 10+ retailers
Not sure which optic to pick?
We ranked every optic by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Red Dot & Optic Guide →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the 18 builds that include this one
BLEM PSA AR15 Complete Classic Stealth Lower, Black
PSA 10.5" Carbine-Length 5.56 NATO 1/7" Nitride Classic SBA4 Pistol KIT
Streamlight ProTac Rail Mount HL-X 1000 Lumen Weapon Light with Tapeswitch
Magpul RVG Rail Vertical Grip - Black
Breek Arms AR-15 Warhammer MOD2 Ambidextrous Charging Handle Black
Daniel Defense Collapsible Mil-Spec Buttstock, Brown - 21-091-04179-011
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Builds Featuring This Part
See all 2 →Builds in the community that include the Holosun 403B Micro Red Dot Sight 2 MOA - HS403B
| Build | Parts | Total |
|---|---|---|
 | 31 | $2997.56 |
 | 20 | $987.06 |
No reviews yet. Be the first to review this product!