Holosun 403B Red Dot – 2 MOA
The 403 is Holosun's long-running 20mm tube red dot — the budget workhorse that put 50,000-hour battery life and Shake Awake into an optic most shooters could afford. Simple, light, and proven across years of carbine use.
Red keeps things simple and efficient. It draws the least current of the three colors, which is part of why the runtime numbers on these sights look the way they do. A 2 MOA dot is the precision choice. It covers two inches at 100 yards, so it doesn't hide a small target, and it's fine enough to shoot groups with rather than just point with.
A single clean dot keeps the sight picture uncluttered, and the 20mm tube mounts with standard micro-optic hardware. Holosun has since replaced this line with the ARO series, so remaining 403 stock is worth grabbing if the classic tube format is what you want.
Specifications
- Reticle: 2 MOA red dot
- Magnification: 1x
- Window: 20mm tube
- Battery: CR2032, up to 50,000 hours
- Housing: Aluminum
- Features: Shake Awake
- Part number: HS403B
Fits: Any Picatinny rail with a micro-optic mount.
Covered by Holosun's limited lifetime warranty on the optic. Ships from WBT Guns, a licensed FFL dealer serving shooters since 2012.
