Holosun 403C Red Dot Black 2MOA Dot

Product Description

The Holosun 403C red dot sight is a compact reflex optic with a 2 MOA dot reticle, built for close to mid-range shooting on AR-15 platforms, patrol rifles, and defensive shotguns.

The 2 MOA dot is small enough for precision at 50 to 100 yards while remaining easy to find under stress. The black finish keeps the optic low-profile on any build.

This model fits shooters who want reliable dot performance without the bulk or feature set of larger enclosed reflex sights. It mounts to any Picatinny or Weaver rail and pairs well with magnifiers for hybrid setups.

Key Facts

• Model: Holosun 403C
• Reticle: 2 MOA red dot
• Finish: Red
• SKU: HSHS403C

Why a 2 MOA Dot Reticle Works for Most Shooters

A 2 MOA dot covers roughly two inches at 100 yards. That size balances speed and precision. Larger dots are faster to acquire but can obscure small targets or precise aiming points. Smaller dots require more focus and slow down close-range shooting.

For defensive use, competition, or general range work inside 200 yards, 2 MOA hits the sweet spot. The dot is quick to pick up when both eyes are open and fine enough for deliberate shots on steel or paper.

Mounting and Compatibility

The Holosun 403C mounts to any Picatinny or Weaver rail using a lower-third or absolute co-witness mount, depending on the base you select. Lower-third lets you use backup iron sights without moving your head. Absolute co-witness places the dot directly over your irons.

This red dot pairs well with flip-to-side or quick-detach magnifiers if you want to stretch effective range. It also works on shotguns, pistol-caliber carbines, and rimfire trainers—any platform with a rail and a need for fast aiming.

For mount height, co-witness preference, or compatibility with specific rifles, send us a message to confirm fitment before you order.

What to Know Before Buying a Holosun 403C

The 403C is a tube-style reflex sight, not a micro red dot. It sits higher than slide-mounted pistol optics and requires a rail mount. Some shooters prefer enclosed tube designs for added lens protection in hard-use environments.

Holosun red dots are known for long battery life and shake-awake technology that powers the optic on when it detects motion. Verify which features are included in the 403C model by calling our shop, because Holosun updates feature sets across production runs.

This optic fits into the red dot sight category alongside reflex, prism, and holographic options. Compare based on reticle size, mounting footprint, and your rifle’s intended role.

Ordering from Western Sport

Order online and it ships straight to your door. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.

Frequently Asked Questions

Q: What is the Holosun 403C best used for?

A: The Holosun 403C is best used for close to mid-range shooting on rifles, carbines, and shotguns where fast target acquisition matters. The 2 MOA dot reticle balances speed and precision for defensive use, competition, and general range work inside 200 yards.

Q: Will the Holosun 403C co-witness with my AR-15 iron sights?

A: Co-witness depends on the mount height you choose when installing the Holosun 403C. Lower-third mounts let you see the dot above your irons, while absolute co-witness mounts align the dot directly over your front sight. Send us a message to confirm which mount height works with your rifle setup.

Q: Can I use the Holosun 403C with a magnifier?

A: Yes, the Holosun 403C works with flip-to-side or quick-detach magnifiers mounted behind the red dot. The 2 MOA dot remains visible and usable through most 3x or 5x magnifiers, extending your effective range without removing the optic. Verify rail space and mount compatibility before ordering a magnifier.

Q: Does the Holosun 403C work on shotguns and pistol-caliber carbines?

A: Yes, the Holosun 403C works on any firearm with a Picatinny or Weaver rail, including shotguns, pistol-caliber carbines, and rimfire rifles. The 2 MOA dot is well-suited to defensive shotguns and PCCs used at home-defense distances.

Q: What is the difference between the Holosun 403C and other Holosun red dots?

A: The Holosun 403C is a tube-style red dot with a 2 MOA dot reticle. Other Holosun models offer different reticle options, mounting footprints, or feature sets such as solar backup or multi-reticle systems.

Additional information