Mounted but never used on firearm while shooting.
 

The Streamlight TLR-4 compact tactical weaponlight and laser is designed to increase lethality of compact and sub-compact handguns. Integrating a visible aiming laser with a high-intensity white light allows shooters to positively identify their target and ensure accurate fire when under stress. 
The TLR-4 features a three position selector switch which allows operators to select between: laser only, LED only, or both laser and LED. Activation is with the standard Streamlight momentary/steady rocker switch found on all of the TLR series of lights. The C4 LED has a 50,000 hour life and emits a 170 Lumen beam and the textured reflector keeps the beam as smooth as possible. The laser is adjustable for windage and elevation.

Features

• Ultra lightweight and compact 
• Amidextrous momentary/steady On-Off switch 
• One handed snap-on and tighten interface keeps hands away from muzzle when attaching/detaching 
• Securely fits a broad range of weapons using key kit provided 
• Windage and Elevation adjustment screws mounted in brass bushings for long life and dependable zero retention of laser 
• Operating temperature: -20°F to +120°F
• IPX4 rated design; water resistant 
• Serialized for positive identification