Vector Optics TAC VEctor M series Quad Rail Bottom Weaver Picatinny Rail Base M16A2 / M4A1

Description:
* Full Metal, 21mm Picatinny Rail, for .223Rem M series , M16 , M4, AR15
* Take apart into two pieces, put picatinny rail onto the bottom of front quad rail system, put the nut & rest piece into the front quad rail (some models does not require the rest piece) and fasten the screws.

Specification:
- Length: 145mm (5.7 inch; Distance between two bolt is 95mm, 3.7 inch)
- Weight (net): 55g (1.9 ounce)
- High-durability aluminum alloy in black matt and beautiful complement
- Shock proof can be used on real fire caliber