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yes it will fit the ruger security 9 just fine The Streamlight TLR-4 is a lightweight weapon-mounted tactical light with an integrated aiming laser. This weapon mount light has a powerful C4 LED with 110 lumens. The Streamlight TLR-4 provides 1.5 hours of continuous runtime when using both the C4 white LED and red laser. The rail clamp on the Streamlight TLR-4 is designed for rapid attachment/detachment and fits a wide range of weapons with the included key kit. Specifications and Features: Powerful C4 LED technology, 110 lumens Red aiming laser, 640-660nm (Class 3R laser, max output less than 5 mW) Runs for 1.5 hours in dual mode - using C4 white LED and red laser Runs for 11 hour when using laser only Ambidextrous three position switch Momentary on or constant on/off Choose laser only, C4 white LED only or both laser and white LED One handed snap-on and tighten for attaching to and detaching from weapon Optimized electronics provides power regulated brightness Textured parabolic ref

Grant, this Laser will fit the Ruger Security 9's Rail no issue. Pictured installed here : https://www.google.com/search?q=Streamlight+TLR4+ruger+security+9&sxsrf=ACYBGNS_NnswNBmt32am4Zb2vq1fcREieQ:1577047076923&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiR7MCWjsrmAhUim-AKHU92Cv0Q_AUoAnoECAwQBA&biw=1280&bih=596#imgrc=9Eo9jN0NwKLVaM: