MPN: 10-169


  • Faster and easier removal / installation of AR-15 barrels, muzzle devices, gas blocks, and handguards.
  • Secure the barrel extension from turning
  • Allows all the torque from barrel nut wrenches to go directly into the barrel extension
  • Does not require sight removal when working on your upper


  • Material: 4140 Chrome Moly Steel
  • Finish: Black


  • AR-15 with 5.56 / .223 / 300BLK barrel
  • HK MR556


If you've ever held your breath while tightening a barrel nut on a receiver held in a vise block, or worse, had to pull apart a rifle that someone had put together with liquid thread lock, you'll appreciate the safety and security the Geissele Reaction Rod gives to your build.

Why Use This Geissele Reaction Rod

When you use a regular receiver vise block, your aluminum receiver and its delicate index pin take a lot of the force involved with assembly. The same is true with the removal of a barrel nut when you need to disassemble a piece. Geissele automatics has resolved this problem by creating the Reaction Rod. Simply clamp the reaction rod in your vise and slide your receiver over it. The rod’s integral spines reach into the barrel extension and hold the piece solidly without marring the outer finish or creating undue stress on parts that you’d like to protect.

The Geissele Reaction Rod simplifies your AR-15 build holding your workpiece safely in either a horizontal or vertical position. Installing hand guards, gas blocks, muzzle devices, and barrels couldn’t be simpler. An added bonus, you no longer have to remove sights and mounts from your receiver’s top rail when you work.

The craftsmen of Geissele manufacture products that make you a more confident Armorer and shooter. They know what you need and what works because they are shooters and armorers too. You can be confident in the quality of Geissele Automatics’ products. Each one is precision machined in North Wales, Pennsylvania, from only the best materials available. Confidence manufactured for you.

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