Geissele Automatics Reaction Rod for AR-15 Uppers

Manufactured by Geissele Automatics
MPN: 10-169
Manufactured by Geissele Automatics
42 Reviews
$79.99 $99.00

In Stock

Standard orders will ship out 2 business days if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



Geissele Automatics AR-15 Reaction Rod was designed to simplify the installation of barrels, muzzle devices, handguards, and gas blocks while redirecting torque from the soft aluminum receiver and fairly diminutive receiver index pin into the barrel extension. Machined from a solid bar of 4140 chrome moly steel, the Reaction Rod features flats for secure clamping either vertically or horizontally in a bench vice. This allows you to simply slide your upper receiver onto the rod where the integral spines will interface with the locking lugs in the barrel's receiver extension. With all torque being transferred into the locking lugs, sheared barrel pins are a thing of the past allowing for worry free installation of barrel nuts, gas blocks, and muzzle devices. As an added bonus, with no wiggling in clamped fixtures, the Reaction Rod won't mar your receiver's finish and doesn't require the removal of mounted optics or iron sights.
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BrandGeissele Automatics
ManufacturerGeissele Automatics
TypeAction Block

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Heavy Duty; Excellent Quality


A bit pricey compared to the competition, but you get what you pay for when you purchase from Geissele. Buying twice, though, is false economy, so this tool gets it right the first time. Fast processing and shipping from PA, as is their norm.

Geissele rod


a must have for a smooth ar build.Fast shipping :)

A "must have" for every AR armorer


Absolutely perfect tool for installation/removal of muzzle devices, handguards, barrel nuts, and more. Any time you need to securely hold your upper for maintenance, this tool does the job.

Reaction rod


Also have the Magpul block, but this is hands down better in a couple of ways. First it slides into the upper receiver for more support. Secondly I like the fact that you can rotate the upper 360 to work on it. Lastly Primary Arms always gets all of my orders out quickly and is truly two day shipping.

excellent product.


excellent product, excellent service from PrimaryArm also.

Perfect tool for the job


Excellent tool for this type of job. Tool is a little pricey however



Expensive? Yes. Quality? Definitely!Much better option than using any other upper receiver type clamp. It fits snug, feels rock solid when attaching a barrel or compensator. Very happy with this purchase!

geissele reaction rod for ar-15 uppers


fit in upper is great, clamps in vise well.holds upper very tight, just have to keep upper pushed toward rod.worked great in 7.62x39 upper as well as 5.56/223, and 300 blackout.

Geissele Reaction Rod


Geissele Reaction Rod from Primary Arms,a must have for your AR builds. A quality piece at a great price, and the shipping was awesome!! Thank you Primary Arms.

Review of product and services


Great product and service from primaryarms