Brownells 308 Barrel Extension Torque Tools. . . sucks


I have a Geissele AR15 reaction rod and while I think it was pricey, I have gotten my moneys worth out of it.  Since I bought it the price has gone up to $100.  If I had to replace it I would probably just buy the Magpul BEV Block at half the cost.

Recently I wanted to get something similar for the 308.  The Geissele AR10/SR25 reaction rod is $200, which seemed a little high to me for a splined shaft.  So I looked around and saw that Brownells had a knockoff for $50.  At one quarter the price I quickly purchased it.

I learned the catch.  I guess Brownells wanted to change the design to avoid copyright or patent issues, so they removed the vise flats and put in a square drive.

Their instruction tell you to put muzzle device or barrel nut wrench in the vise, install a torque wrench or breaker bar into their reaction rod copy, slide their reaction rod knockoff into the action, and precariously balance the upper between your wrench in the vise, and the wrench in the reaction rod knockoff, and torque it all down with out dropping anything.  Good luck with that.

I found I could sometimes clamp the round rod in the vise tight enough that I could use it like a Geissele reaction rod.  I finally ended up just milling some flats in it so I could secure it in a vise.

Unless you have the capability to put a flat on the Brownells tool, I’d recommend passing on it.


  1. I use a piece of 1/2″ square tool steel and clamp it in my vice, then slide the Brownells tool onto it. You’re right, it’s not as good as the Geissele, but for how often I’m wrenching on ar10 type rifles, it serves its purpose.

    • Personally, I like having the rod mounted horizontally where I can easily look along the upper and see everything is lined up. Had I used something like that I would risk dropping the Brownells rod and upper.
      First time I used it I did do that with the rod mounted vertically. That did work well enough, but I much prefer having the flats.

      • Right, I clamp the 1/2″ bar sideways, just like a Geissele reaction rod. And for sure, the flats are preferable, but this was a quick, easy way to make it work with available materials on hand.


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