Safariland 6354RDSO Springfield Armory Echelon 4in OWB Belt Holster w/ QLS19 Fork Right Stx Tactical Duty Black. Its Automatic Locking System (ALS) secures the firearm. Unlike Safarilands RDS series the RDSO has an open pocket that protects the optic and does not use a flip-up dust cover. Specifications for Safariland 6354RDSO Springfield Armory Echelon 4in OWB Belt Holster w/ QLS19 Fork: Manufacturer: Safariland Gun Make: Springfield Armory Gun Model: Springfield Armory Echelon Hand: Right Holster Type: Outside the Waistband Holster Belt Holster Holster Material: SafariLaminate Light/Laser Attachment: SureFire X300U Accessory Attachment System: Belt Loop Attachment Type: Belt Loop/Slot Holster Size: Regular Application: Duty Quantity: 1 Fastener/Closure Type: ALS - Automatic Locking System Condition: New Age Group: Adults Gender: Unisex Features of Safariland 6354RDSO Springfield Armory Echelon 4in OWB Belt Holster w/ QLS19 Fork ALS (Automatic Locking Systems) secures weapon once holstered; simple straight up draw once release is deactivated. Open-top design without SLS for quick retrieval of weapon. For use with red dot optic-equipped weapons. SafariLaminate thermal-molded construction protects handgun and sights. Package Contents: Safariland 6354RDSO Springfield Armory Echelon 4in OWB Belt Holster w/ QLS19 Fork What firearm models does the manufacturer say Safariland 6354RDSO Springfield Armory Echelon 4in OWB Belt Holster w/ QLS19 Fork is compatible with? The manufacturer says that Safariland 6354RDSO Springfield Armory Echelon 4in OWB Belt Holster w/ QLS19 Fork is compatible with Springfield Armory EchelonSafariland 63541572131MS19: 6354RDSO Springfield Armory Echelon 4in OWB Belt Holster w/ QLS19 Fork Right Stx Tactical Duty Black