ArmaLaser GTO/FLX Finger Touch Red Laser Sight for H&K VP9SK Black. ArmaLaser designed these Red Laser Sights with 2 options for activation: the FLX switch for intuitive instant activation and the switch on the GTO that you can access with your index finger. The master on/off switch on the ArmaLaser GTO/FLX Red Laser Sight lets you turn it off to use BUIS or other optics. Customize your H&K pistol with the ArmaLaser GTO/FLX Finger Touch Polymer Red Laser Sight. Specifications for ArmaLaser GTO/FLX Finger Touch Red Laser Sight for H&K Handguns: Manufacturer: ArmaLaser Color: Black Beam Color: Red Laser Output: 4 mW Wavelength: 635 nm Maximum Range: 50 ft Attachment Type: Picatinny Battery Type: 357 CR1/3N Lithium Battery Quantity: 2 Gun Make: Heckler & Koch Features of ArmaLaser GTO/FLX Finger Touch Red Laser Sight for H&K Handguns Grip-Touch Activation by using FLX Side-Touch Activation without FLX Ultra-bright Class 33R 635nm Package Contents: ArmaLaser GTO/FLX Finger Touch Red Laser Sight for H&K Handguns What firearm models does the manufacturer say ArmaLaser GTO/FLX Finger Touch Red Laser Sight for H&K Handguns is compatible with? The manufacturer suggests that ArmaLaser GTO/FLX Finger Touch Red Laser Sight for H&K Handguns is compatible with Heckler & Koch HK45 Compact Heckler & Koch HK45 Heckler & Koch P2000SK Heckler & Koch P2000 Heckler & Koch P30 Heckler & Koch P30L Heckler & Koch VP9 Heckler & Koch VP9 SK Heckler & Koch P30SKArmaLaser GTOFLX82: GTO/FLX Finger Touch Red Laser Sight for H&K VP9SK Black