FAB Defense AR-15/M4 GL-CORE Buttstock – Fits Mil-Spec & Commercial Buffer Tubes

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OPEN BOX RETURN - AT3™ Mil Spec Buffer Tube Kit - AR-15

AT3™ Mil Spec Buffer Tube Kit For AR-15


FAB Defense Gradus AR-15 Pistol Grip Flat Beavertail

FAB Defense Gradus AR-15 Pistol Grip with Flat Beavertail - Black


Compact & Sleek Buttstock For Both Mil-Spec & Commercial Buffer Tubes

The FAB Defense GL-CORE Buttstock is an upgrade for AR-15/M4 Platforms designed with integrated cheek weld and an ergonomic buttpad that provides a high level of efficiency and comfort.

It includes interchangeable adapters to fit securely on both Mil-Spec and Commercial buffer tubes and it’s designed with an inverse positioning lever so it will remain safe and secure and will not accidentally open on Mil-Spec and Commercial buffer tubes.

FAB Defense AR-15/M4 GL-CORE Buttstock - Fits Mil-Spec & Commercial Buffer Tubes

Made With Lightweight Fiberglass-Reinforced Polymer

The GL-CORE Stock has a compact and sleek design is made from lightweight fiberglass-reinforced polymer making it highly durable for any kind of activity and all weather conditions. It also features an ergonomically shaped rubberized butt-pad, so you’ll be able to quickly shoulder and easily maneuver your weapon in the field.

The stock also has two integrated quick-detach rear sling swivel connectors so that you can seamlessly attach a sling for a more comfortable carry.


  • Ergonomically shaped rubberized butt-pad for quick shouldering and easy maneuvering of the weapon
  • Interchangeable buffer tube adapters for a tight fit on Mil-Spec and Commercial buffer tubes
  • Integrated cheek weld in an overall compact and sleek design
  • No protruding parts, will not get caught on gear or webbing
  • Inversed positioning lever will not open accidentally
  • Two integrated quick-detach rear sling swivel connectors
  • Made of durable and light-weight fiberglass reinforced polymer composite


  • Platform: M4, AR-15
  • Hand: Ambidextrous
  • Fabric/Material: Fiberglass Reinforced Polymer
  • Weight: 271 gr
  • Width: 52 mm
  • Height: 131 mm
  • Length: 180 mm

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Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Fab Defense Limited Lifetime Warranty

  • FAB DEFENSE warrants to the original end-user/customer that the products specified below are free from defects in materials and workmanship.
  • Subject to the provisions, conditions, and limitations set forth below, FAB DEFENSE will, at its sole discretion, either repair or replace any part of its products found and proven to be defective by reason of improper workmanship or materials or damage due to harsh service conditions.
  • FAB DEFENSE will provide repair parts or replacement products on an exchange basis, and such parts shall be either new or refurbished, provided they are functionally equivalent to new parts.
  • In the event that FAB DEFENSE is unable to repair or replace the defective product, it will refund the current value of the product at the time the warranty claim was made.
  • This limited lifetime warranty shall not cover any damage inflicted on this product as a result of improper installation, accident, abuse, misuse, natural disaster or modification. This lifetime warranty shall not apply to any product that had been sold as used/second-hand or that had been resold.
  • This limited lifetime warranty shall not extend to any product or damage to a product caused by failure to follow the instruction manual, through abuse or misuse or improper usage of the products.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Customer Reviews

Based on 21 reviews
Nice stock

I have a Magpul stock tried this Fab defense out I got to say I like it better than the Magpul I had it fits in the arm well better it just feels better fits the buffer tube nicely honestly I wish I had bought it a long time ago just my opinion

Thanks for the review. We're glad you like the stock!

FAB Defense AR-15/M4 GL-CORE Buttstock

AT3 tactical Is My favorite online store. Quickest shipping that i've ever ordered from.. And this stock is perfect on my VR 80

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

Brock Georgeson
AR15 upgrades

Fab Defense is great quality. The fit was perfect

Carl Schreyer

FAB Defense AR-15/M4 GL-CORE Buttstock - Fits Mil-Spec & Commercial Buffer Tubes

Thank you for leaving a review for the FAB Defense AR-15/M4 GL-CORE Buttstock. We are glad to hear that it fits both Mil-Spec and Commercial Buffer Tubes. We strive to provide products that meet the needs of all our customers.

John Ballew

On the bench, on the ground, standing or three gun, would definitely purchase it again. Fitz snug, very reliable.