The 6354DO features the Automatic Locking System (ALS) and is specifically made for use with red dot optic-equipped weapons. This holster is available with an infrared signature reducing Cordura nylon finish in several US military issue colors and camouflage. It also features a double leg strap leg shroud which includes mounting holes for optional accessories. The 6354DO incorporates the Safariland 3-hole pattern allowing the user to mount the holster in various configurations with the use of the Quick Locking System (QLS). Gun fit: Glock 23 Gens 1-4 ITI M3 Glock 23 Gens 1-4 Streamlight TLR-1 Glock 23 Gens 1-4 Nightstick TWM-850 Glock 23 Gens 1-4 Nightstick TWM-850S Glock 19 Gens 1-4 ITI M3 Glock 19 Gens 1-4 Streamlight TLR-1 Glock 19 Gens 1-4 Streamlight TLR-1HL Glock 19 Gens 1-4 SureFire X200 Glock 19 Gens 1-4 SureFire X300 Glock 19 Gens 1-4 SureFire X300U Glock 19 Gens 1-4 SureFire X300V Glock 19 Gens 1-4 Inforce APL Glock 23 Gens 1-4 Streamlight TLR-1HL Glock 19 Gens 1-4 Nightstick TWM-350 Glock 19 Gens 1-4 Nightstick TWM-350S Glock 19 Gens 1-4 Nightstick TWM-850 Glock 19 Gens 1-4 Nightstick TWM-850S Glock 23 Gens 1-4 SureFire X200 Glock 23 Gens 1-4 SureFire X300 Glock 23 Gens 1-4 SureFire X300U Glock 23 Gens 1-4 SureFire X300V Glock 23 Gens 1-4 Inforce APL Glock 23 Gens 1-4 Nightstick TWM-350 Glock 23 Gens 1-4 Nightstick TWM-350S