While not necessary for maintaining retention, all Ragnarok holsters can accommodate slide mounted optics, threaded barrels, suppressor height sights <. While it is a passive-retention holster (no hood/strap/button to deactivate the holster), it features adjustable retention using screws along the edge of the holster. 125 precision-formed Kydex, it is quite the beast of a holster. The Ragnarok holster was made to be extremely modular, tough, modern, and fast. There is not sufficient retention to be used safely. Light-compatible models WILL NOT WORK without the light. Click here for more specifics on model fit.