Vector Optics TAC VEctor Universal M series Triple Picatinny Rails Rifle Gun Barrel Mount Metal Clamp Accessories

Features:
* Install on the barrel
* Bottom and two side 21mm picatinny rails (Tri Rail)
* High quality aluminum alloy in durable black matte finish
* Shock proof
* With four pieces of half rounds (metal) adapters, one pair for installation and the other is for spare

Specification:
- Length: 65mm (2.6 inch);
- Inside Diameter: 17.6mm (0.7 inch)
- Weight (net): 100g (3.5 ounce)