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 17 Gens 1-4 Glock 22 Gens 1-4