Real Avid Lug-Lok Upper Vise Block AR15 Short Sleeve Shirts are in on-board carriers that

are in on-board carriers that swings out to let you choose your bit

5mm AX-Suede™ provides precision feel and high dexterity

Hard-shell knee caps with Trion Non-slip grip technology

Keeps your expensive gear from getting lost or stolen

Real Avid Lug-Lok Upper Vise Block AR15 Short Sleeve Shirts are in on-board carriers thatADVANCED THINKING, AR15 UPPER BLOCK 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