<https://demo.saphali.com/product/truglo-tfx-pro-tritium-fiber-handgun-sight-ruger-amer#product>
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"The TRUGLO Brite-Site TFX Handgun Sights glow bright both day and night.  TFX sights are always ready.  TFX takes the award-winning Tritium + Fiber-Optic technology even further with all the features our customers requested: compact snag-free design, longer sight radius, and amazingly durable construction built to handle just about anything.  Illuminating elements are encased inside a virtually indestructible chemical and shock-resistant capsule and the CNC-machined steel is protected with a rust-resistant Fortress Finish.  The white Focus-Lock ring surrounding the front fiber makes it even more visible, encouraging the eye to rapidly focus on the front sight for improved speed and accuracy.  TFX sights will amaze even the most discriminating shooters.Fully protected TFO technology encapsulated in a virtually indestructible configurationImpervious to oils, chemicals, cleaning solvents, and ultra-sonic cleaning processGlows-in-the dark - no batteries or light exposure requiredAssembled in the USA with quality Swiss Tritium for maximum brightnessFront sight Focus-Lock for fast and accurate shootingFortress Finish provides a permanent protective coating for maximum protectionFits standard holsters***WARNING: This product can expose you to chemicals including lead or DINP, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.***"
<https://demo.saphali.com/product/truglo-tfx-pro-tritium-fiber-handgun-sight-ruger-amer>