Modular Action Wrench – Kit


Kit includes the Modular Action Wrench Body, (1) Modular Action Wrench Head of your choice, and a large and small delrin bumper.
Action Wrench Body (included)
Select Action Wrench Head:
See list below for action compatibility.
Categories: , Product ID: 4463


Modular Action Wrench Kit


**DO NOT use SAC action wrench head without proper SAC bumpers**

Wrench includes 1 head of your choice, large bumper & small bumper.  Additional heads can be purchased.

***When ordering on this page, select appropriate action model from the drop down menu, it will include the complete kit of a wrench body, selected head, appropriate front bumper*** 

The KIT includes ONE Action Wrench Head of your choice. Click HERE to purchase additional heads if needed.


The Modular Action Wrench is a modular system composed of a few parts.  

Wrench Body

After extensive torture testing we manufactured our wrench bodies out of 4140 Alloy Steel with a super hard heat rating of HRC 32.  With our unique modified 3/8″ square drive interface is tool-less and offers super quick wrench head changes. On the back end, we have a standard 5/8″ Hex to work with any standard 6 point or 12 point socket. With a nominal .685″ body diameter, it works with a large array of actions from Howa 1500’s, Tikka T3’s to the Surgeon XL magnum action.

Wrench Head

The heart of our system. The action wrench heads are quickly secured to the wrench body with out the use of tools.  Each action wrench head is designed to properly fit specific actions ensuring proper torque transfer to the action with out any damage.  Most of the action wrench heads are Wire EDM cut to a .001″ tolerance out of 4140 Alloy Steel, then heat treated to HRC 32 to be softer than the action, yet standing up to abuse. Finally we finish the action wrench heads with a corrosion resistant black nitride finish to ensure a long service life.

One of the best features of our action wrench heads is that they work with most 3/8″ Square Drive Extensions that are currently available on the market. 

Front Bumper

At the very front of the Modular Action Wrench assembly is our front bumper. Made in two lengths for barrels with counterbores and with out counterbores. Made of super strong Delrin, the front bumpers main purpose is to properly secure the action wrench head to the body via a 8/32 thread. Secondly, the front bumper properly locates the action wrench assembly into the action, ensuring that the head is precisely in the correct spot to prevent any damage to the action. Lastly, the front bumper protects the face of the barrel. It never made sense to us at Short Action Customs why people insert hard, steel objects and press them up against the face of the barrel.

Simply select the appropriate model number for the action you wish to use. If you do not see your action listed, please contact us, we are always developing new action wrench heads and some actions may work with certain models. We will update the list. 

*** Indicates Right Hand Configuration Only

Model 1: Remington 700 actions, Defiance Deviant/Ruckus/Rebel actions (does not if Defiance Elite), Impact 737 actions, Bergara B14, Lone Peak Fuzion.

Model 2: Winchester M70, FN SPR actions, Springfield 1903 ***

Model 3: American Rifle Company Mausingfield actions ***

Model 4: BAT Machine TR and similar actions

Model 5: Tikka T3 actions

Model 6: Howa 1500 actions ***, Borden actions, Kelbly’s actions

Model 7: Bighorn TL, SR, and Origin actions, ejector must be removed. Gunwerks GLR Left and Right, Savage Small Shank.

Model 8: American Rifle Company Nucleus/Archimedes actions

Model 9: Curtis Custom actions only, will no work with Terminus actions

Model 10: Defiance Elite, Pierce actions, Tuebor Raider

Model 11: Defiance .750″ diameter bolts, Surgeon XL

Model 12: Sako A7

Model 13: Surgeon 591

Model 14: Terminus actions, will work with Curtis Customs

Model 15: Sako TRG actions

Model 20: McMillan TAC50 actions


At Short Action Customs, we are only concerned with making the best products. Our Modular Action Wrench comes with a lifetime guarantee against any manufactured defects and has a 100% lifetime replacement for any broken parts. We have thoroughly tested the wrench bodies and they are capable of handling impressive torque values.  However we guarantee our parts to handle 125  ft/lbs. of torque. Torqueing above 125 ft/lbs. will void your warranty on the wrench body and the wrench heads. The wrench heads are softer than most actions, they will get normal wear and tear, however if any break or crack, we will replace them at no charge.



Additional information

Weight 20 oz
Dimensions 11 × 8 × 4 in


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