Take apart into two pieces, put picatinny rail onto the bottom of front set system, put the nut & rest piece into the front set (some models dont need to put the rest piece) and fasten the
screws.
Length: 145mm (length of two bolt is 105mm)
Weight: 55g (1.9 ounce)
High-durability aluminum alloy in black matt and beautiful complement
Shock proof can be used on real fire caliber
One piece auction. Two on picture is only for shape and installation reference