The 6390RDS holster is specifically designed for firearms with red dot sights mounted to them. This open-top holster features the Automatic Locking System (ALS®), an internal locking device that retains the weapon in all directions with no straps or snaps to manipulate. Once the weapon is holstered, it locks into place. The holster is completely operable with the thumb and once the ALS® is deactivated a simple straight-up draw is used. Features a low-ride belt loop that is 1.5" lower than standard, rides close to the body, and has a suede lining to protect the gun's sights and finish. FEATURES ALS® (Automatic Locking System) secures weapon once holstered; simple straight up draw once release is deactivated Open-top design without SLS for quick retrieval of weapon Cordura™ nylon-wrap finish reduces Infrared (IR) Signature For use with red dot optic-equipped weapons SafariLaminate™ thermal-molded construction protects handgun and sights Suede lined to protect handgun's finish Optic Hood Cover Includes Mid-Ride UBL SPECIFICATIONS Finish: Multicam & Ranger Green: Cordura, reduces Infrared (IR) signature. Finish: Black & Coyote Brown: STX Tactical, hard shell finish that's easy to clean and maintain. Hand: Right Hand Weaponlight: Streamlight TLR-1, Surefire X200, Surefire X300, Surefire X300U, Surefire X300V, Streamlight TLR-1HL Optic: Trijicon RMR, Dr. Optic, JR Enterprises J Point, Vortex Viper, Burris FastFire, Vortex Venom & More FIT Model 832: Glock 17, 22 w/ TLR-1, TLR-1HL, SureFire X200, X300, X300U, X300V  Model 2832: Glock 19, 19C, 23, 23C, w/ TLR-1, TLR-1HL, SureFire X200, X300, X300U; Inforce APL Gen 3, Insight XTI Procyon  Model 6832: Glock 34, 35 w/ TLR-1, TLR-1HL, SureFire X200, X300, X300U, X300V. Will fit "Roland Special" Glock 19 with KKM Barrel/Compensator and SureFire X300 Ultra weapon light Model 4502: Sig P320, P320RX w/ TLR-1, TLR-1HL, SureFire X300U, X300V Note: Glock options are compatible with Gen 1-5 Glock pistols EXCEPT the Glock 22/23 Gen 5 due to thicker slide width. Safariland® cannot guarantee that RDS holsters will be compatible with non-factory (Glock MOS, M&P CORE, etc.) mounted red dots.  Numerous variables including depth of RDS into slide, use of dovetail, placement on slide, etc. can all affect the fit of the holster.