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UTG PRO S3 Mil-Spec Buttstock Kit - All Parts Included - Buffer, Tube, Springs, & More

UTG PRO S3 Mil-Spec Buttstock Kit – All Parts Included – Buffer, Tube, Springs, & More

In Stock

90 Day No-Hassle Returns We Pay Return Shipping

We have a 90-day no-hassle return policy. We pay return shipping.

If you need to request a return, contact us at support@at3tactical.com and we will send you a return label

After 90 days, defective items will still be covered under the manufacturer’s warranty, where applicable.

Please refer to the product listing for warranty details. If you have specific warranty questions, contact us at support@at3tactical.com. We may direct you to pursue your warranty claim directly with the manufacturer.

Your satisfaction is our #1 priority

If you’re dissatisfied with your purchase, in any way, please contact us at support@at3tactical.com – we will do our best to make it right.

Fast & Free Shipping On orders over $50

You will receive fast, free shipping for all orders over $50

Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.

Most orders received by 1pm CST ship the same day

You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.

UTG PRO S3 Mil-Spec Buttstock Kit – All Parts Included – Buffer, Tube, Springs, & More

  • Built for Heavy-duty Use with the Tightest Tolerance Controls to Provide the Most Secure Fit and Function
  • Mil-spec Stock Molded from Impact Resistant High-strength Polymer in Black
  • Mil-spec Diameter Extension Tube Precision Machined from Aircraft Grade Aluminum with Rolled Threads, and Anodized for Best Corrosion and Wear Resistance
  • Built-in Rubberized Butt Pad and a Slanted Cheek Rest Enhances Shooting Stability and Promotes Consistent Firearm Control
  • Integral Ambidextrous Sling Loop and QD Sling Swivel Housing for Left or Right Handed Shooters
  • Unique 6.05″ Length and Sub Compact Profile for superior lightweight, yet comfortable performance with 6 position adjustability
  • Snag Free Performance with Fully Dehorned Corners and Melted Contours for Increased Comfort
  • Made in the USA


  • Polymer Stock
  • Mil-spec 6 Position Extension Tube
  • Carbine Buffer
  • Buffer Spring
  • Tear-drop Ring
  • Castle Nut


  • Material: Aluminum/Polymer
  • Height: 4.75″
  • Length: 6.05″
  • Weight: 16.9 oz
  • Color: Black

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Customer Reviews

Based on 4 reviews
Great price great service

Items I ordered were shipped quickly, and are of good quality.

Thanks for sharing your feedback, Christopher. We're glad you're satisfied with your purchase. Cheers!
Finished her off nicely

Part was perfect fit, I like the flat finish, and black hardware which matches the theme. The lever lock is much better than other stocks ive seen, positioned and shaped nicely. Instructions included are very helpful, and lucid. AT3 provided very prompt service, despite being 1000's miles away, i received my merchandise in a few days!

That looks perfect! Thank you for the great review, Carl.We really appreciate you taking the time out to share your experience with us—and we agree, UTG PRO S3 Mil-Spec Buttstock Kit is truly great! - AB

Good hardware. Love the 2 stage trigger.

It's our pleasure doing business with you, Fred! And thank you for the feedback. --LM
Moving on up

The UTG stock assembly I purchased is top quality, designed well and functions like the other brand name stocks I own. I have been watching this company produce better and better quality products that I consider top of the line. I have to give them credit for stepping up to the plate in their product improvement and innovative design. I also like the fact UTG is making more products in the USA than in the past. No longer a 2nd tier supplier.

Thank you for the input, Kent! We appreciate the detail