1.Top flat picatinny rails, other three sides key hole cutout

2.Overall Length: 195mm (7.7 inch)

3.Weight (net): 275g (9.7 ounce)

4.Inside Dia 46mm (1.8 inch)

5.Lower rail style with CNC procedure

6.One piece style more accurate

7.Upper rail is extended over the barrel nut for a 'no-gap' monolithic look

8.Light weight in precision

9.Easy and quick installation

10.High quality aluminum alloy in durable black matte finish

11.With tools, 2 pcs 2" detachable picatinny rails and gift box

12.Shock proof can be used on real fire caliber