ST-3X Chassis Rifle Buttstock

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Modular Adjustable Rifle Stock

  • CNC machined from solid billet aluminum
  • Skeletonized lightweight body
  • Vertical buttpad adjustment to get a perfect fit
  • Simple length of pull (LOP) & cheek rest height adjustment
  • Integrated M-LOK™ bag rider or mono-pod attachment point
  • QD flush cup sling mount on both right and left side 


Fits rifle chassis systems with buffer tube style stock attachment. NOT compatible with AR-15 rifles or other rifles with a moving buffer system


Limited Lifetime Warranty

All Rival Arms parts are backed with an amazing warranty. View full warranty details.

Limited Lifetime Warranty

We proudly build, machine, and source everything in the United States of America, from our barrels to our packaging and stickers.

Limited Lifetime Warranty

Whether it is our barrel steel or our coatings, using the best available materials translates to superior accuracy and durability.

Limited Lifetime Warranty

We focus on modular design concepts as much as possible, ensuring compatibility with America's favorite firearm platforms.