Airsoft 101 talks about the Safariland QLS or Quick Locking System in this video... "The safariland QLs system is designed to give you the greatest versatility when talking about holsters, it allows you to use several pistols by making quick changes by being able to change the holster in a very fast and simple way, it serves to hold both holsters and rigid pouches and even some soft pouches to hold mags or utility pouches, it will also allow you to move the holster or pouch in question to any space you want, either molle on a battle belt or a plate carrier, or to mount it on a thigh rig or a waist rig etc."