an improved mounting device for enabling a user to quickly and securely attach and detach an accessory to a magpul mlok rail of a firearm . in a preferred embodiment of the present invention , the device comprises an upper portion , a lower portion , and at least one locking mechanism to enable a user to quickly removably attach the improved mounting device to an mlok rail on a firearm . in a further preferred embodiment of the present invention , the device also comprises a side wedge and side wedge spring .