The 6354RDS holster is specifically designed for firearms with red dot sights mounted to them. This model features the Automatic Locking System (ALS), an internal locking device that retains the weapon in all directions providing secure retention in an open-top holster for tactical use. With ALS, once the weapon is holstered, it ”locks” into place, providing an extra measure of security for the weapon. Further, the holster is completely operable with the thumb, making it very instinctive to use. And finally, once the device is de-activated a simple straight up draw can be used. Key to comfort and stability are the lightweight double leg strap and the leg shroud. SafariSuede lining helps protect the gun’s sights and finish. Gun fit: Glock 17 MOS ITI M3 Glock 17 MOS Streamlight TLR-1 Glock 17 MOS Streamlight TLR-1HL Glock 17 MOS SureFire X200 Glock 17 MOS SureFire X300 Glock 17 MOS SureFire X300U Glock 17 MOS Leupold Deltapoint Glock 17 MOS Trijicon RMR Glock 17 MOS Dr. Optic Glock 17 MOS J Point Glock 17 MOS Vortex Viper Glock 17 MOS Burris FastFire Glock 17 MOS Inforce APL Glock 17 MOS Nightstick TWM-350 Glock 17 MOS Nightstick TWM-350S Glock 17 MOS Nightstick TWM-850 Glock 17 MOS Nightstick TWM-850S