The 6354RDSO holster is designed for firearms with red dot sights. Its Automatic Locking System (ALS) secures the firearm. Unlike Safariland’s RDS series, the RDSO has an open pocket that protects the optic and does not use a flip-up dust cover. This holsters has the QLS 19 Locking Fork installed. The QLS 19 fork can be used any mounting platform (leg shroud, belt loop, etc.) that has the QLS 22 Receiver Plate installed. Safariland® cannot guarantee that RDS holsters will be compatible with non-factory (Glock MOS, M&P CORE, etc.) mounted red dots. Numerous variables, including placement of the RDS on the slide, use of dovetails, can affect the fit.