Aluminum Alloy For M-LOK,Keymod Fit For M300 M600 light Picatinny Rail and riflescope 1.QD install The Mount of the flashlight is directly fixed on the extension rail of this product, which is Advantage：convenient for disassembly and replacement 2.Embedded install Fit the base of the flashlight into the groove of the extension rail of this product and fix it with the attached screws Advantages: Reduce weight, stabilize structure, save space