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Big Dot Shotgun Bead - Vent Rib

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Big Dot Night Sights are defensive tritium sights designed to enhance your home defense shotgun. The sights use a proprietary photoluminescent Glow Dot that absorbs ambient light and glows in low light. The convex dot's additional surface area increases light absorption, intensifying the charge of the Glow Dot. Designed to be large and highly visible, these sights help solve many issues, from aging eyes to deteriorating vision. XS Tritium Night sights are big, bright, and easy to see day or night!

The sights are CNC machined from solid steel bar stock by our in-house machine shop. We design, machine, and insert our tritium to produce the highest quality possible and provide American Made products.


  • Tritium powered front sight
  • Big Dot front measures 0.188"
  • High-contrast colored front sight
  • (Orange front) Glow dot absorbs ambient light and glows in low light
  • (White front) Reflective white dot with tritium center
  • Durable CNC machined steel
  • 12 year warranty on tritium


These sights require a .120 - .140" diameter bead. Kit comes with replacement bead for Mossberg shotguns. If the current shotgun bead is not in that diameter range and is not a Mossberg, Brownells #6 or #26 front bead will need to be purchased and installed before XS Big Dot. Installs with any two-part epoxy, like JB Weld. View Written Installation Instructions.


Why Choose Our Big Dot Shotgun Bead?

Choosing our Big Dot Shotgun Bead for is the ultimate way to upgrade your shotgun's front sight. Our bead is a game-changer for home defense shotguns, enhancing visibility in various lighting conditions – low light, daylight, or whatever life throws your way. With the integration of a high-quality XS Sight, you're investing in a sight that promises reliability.

Designed for Clarity & Durability

Our shotgun bead is crafted from solid steel, ensuring longevity and resilience in even the toughest environments. Looking for a sight for your defensive shotgun? Our sight's low-profile design won't snag or obstruct your field of view. The XS Big Dot tritium, provides a glowing front sight bead in low light conditions, ensuring that your target is always in sight.

Adaptable & Easy to Install

Our shotgun sight replacement adapts seamlessly to your existing setup. Our kit is designed for easy drop-on installation on any vent rib barrel. From its glow dot feature for better sight in low lighting conditions to the durable sight base, every aspect of our shotgun sight is designed with you, the user, in mind.


About XS Sights

We are a small, second-generation family-owned business based in Fort Worth, TX, and our customers are family. We live, eat, and breathe guns. We manufacture tritium night sights for pistols, shotguns, revolvers, AR-15, and AK rifles. We also build gunsmithing tools, shotgun magazine tube extensions, and optic mounts. We offer ghost ring and optic mounting solutions for lever action, bolt action, and black powder long guns for hunting. Upgrade today and discover the XS Advantage.


WARNING: This product can expose you to lead, which is known to the State of California to cause cancer and birth defects or reproductive harm. (For more information go to

Tritium Products — XS Sights warrants all handgun sights containing tritium to be free from defects in material and workmanship. Tritium illumination is warranted to glow for twelve (12) years. This warranty applies only to the original purchaser. Proof of purchase is required for an RMA. If this product is found to be defective, the manufacturer's only obligation is to replace the product at the manufacturer's discretion, provided that the product has not been damaged through misuse, modifications, neglect, or mishandling. XS Sights will not be responsible for product removal or installation labor costs. — Tritium illumination will dim throughout the product's life and is not subject to warranty claims. This warranty shall not apply to the finish on any portion of the product or weathering, as this is considered normal wear and tear. Sights improperly installed are not subject to warranty. — XS Sights only warrants products sold through authorized resellers. — All international sales are final and do not qualify for this warranty policy. Some authorized international resellers carry common warranty items to provide for their customers. For more information, please see our International Shipping Policy.