Geissele Super Reaction Rod

The Geissele Super Reaction Rod represents the professional-grade solution for upper receiver work, specifically engineered to protect expensive receivers during barrel nut installation and removal. Unlike traditional upper vise blocks that clamp the receiver's exterior surfaces, the Super Reaction Rod inserts through the upper receiver and engages directly with the barrel extension lugs. This design transfers all torque forces to the barrel extension itself, completely eliminating stress on the upper receiver's index pin and preventing any risk of receiver damage during high-torque operations.

The Super Reaction Rod was designed with advanced armorers in mind, particularly those who frequently work with over-torqued, seized, or Loctited barrel nuts that require significant force to break free. The pre-loading system mates the barrel extension to the rod's lugs before adding torque to the barrel nut, while simultaneously fixing the upper receiver in place. This pre-loading eliminates any movement before torquing begins, removing potential stress that could be placed on the index pin and ensuring the receiver remains properly aligned throughout the operation.

The hardened steel construction withstands tremendous torque without flexing or deforming, making this tool suitable for both professional armory use and serious home builders who demand the safest barrel nut installation method. The pre-loading system can be removed to allow the rod to work like a standard reaction rod, enabling 360-degree upper receiver work both vertically and horizontally. The vise-compatible base provides a stable mounting platform that works with any standard bench vise.