The Geissele Reaction Rod is a vise mounted rod designed to make the installation and removal of barrels, flash hiders, gas blocks and hand guards much easier and simpler. An AR-15 Upper Receiver slides onto the rod and the rod?s integral splines enter the barrel extension and secure the barrel extension from turning. This allows all the torque from barrel nut wrenches goes directly into the barrel extension instead of the receiver itself. Machined and cut from a solid bar of 4140 Chrome Moly steel, properly quenched/tempered and ground to an exact diameter. The Geissele 556/223 Reaction Rod is also compatible with the HK MR556 upper receiver.
Designed for 5.56/.223 caliber Upper Receivers.