Riflespeed Adjustable Low Profile Gas Block RS7558 AR15/AR10 Gas Control Assembly, 0.750" Gas Block Diameter, Control Knob Length 5.8"

The revolutionary Riflespeed Gas Control System makes controlling your rifle's gas flow reliable, repeatable, and foolproof. Need more gas? Turn it up. Need less gas? Turn it down. With the easy-to-grasp Control Knob, it's that simple and no tools are required. The highly visible numbering on the Control Knob ensures that you'll always know your setting. Return to a previous setting instantly by simply turning the Control Knob. Each setting is indicated by a highly tactile "click" for use during