Real Avid/revo Lug-lok, Avid Avar10llvb Lug-lok Upper Vise Block - Ar10

Traditional clamp style upper blocks fit poorly and can exert enough inward pressure to damage the receiver when applying torque to a barrel nut or flash suppressor.That's bad design.So, we designed an upper block that leverages the strongest part of the gun the barrel lugs inside the star chamber.The lug-lok is precision machined and precisely fits into all mil-spec uppers.It mates perfectly with the barrel lugs, while allowing you to rotate the upper to be able to work on different sides.There are 2 vise pins that allow you to hold the upper at multiple working angles and prevent unwanted rotation during high torque application.The lock knob keeps lug-lok seated into the barrel lugs.