Instinctive thumb release disengages the locking mechanism from the Rail Attachment Device when drawing the handgun Active retention mechanism locks onto our proprietary Rail Attachment Device Fits almost any semi-automatic handgun with an accessory rail Rail Attachment Device (RAD) is the bridge that connects a handgun to the OMNIVORE Non-Light Bearing holster. The RAD easily attaches to the accessory rail of the handgun, and engages the locking mechanism in the OMNIVORE Non-LB holster. The RAD attaches to almost all existing accessory rails, and removes easily when needed.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }