The FAB Defense GLR-16 black for M4/AR15 is an advanced adjustable stock designed for users who demand more than a standard upgrade. It is built to deliver real improvements in stability, ergonomics and operational functionality.

At the core of the GLR-16 is the patented Anti-Rattle mechanism, engineered to eliminate play and vibration by ensuring a tight, secure fit on both Mil-Spec and commercial buffer tubes. The result is a noticeably more solid and consistent shoulder interface compared to entry-level stocks.

The ergonomic rubberized buttpad provides enhanced grip and recoil absorption, allowing faster and more stable shouldering, especially in dynamic scenarios. The stock maintains a streamlined, snag-free profile that won’t interfere with gear or movement.

A key functional advantage is the integrated waterproof, anti-rattle storage compartment, designed to securely hold CR123 or AA batteries without internal noise or movement — a practical feature for field use.

For sling configuration, the GLR-16 offers maximum versatility with:

3 integrated sling slots

2 ambidextrous rear QD sling sockets (metal reinforced)

This allows quick adaptation to different setups, from single-point to two-point slings.

Additionally, the platform is compatible with an optional adjustable cheek rest, making it ideal for users running optics who require improved eye alignment and shooting comfort.

Constructed from fiberglass-reinforced polymer, the GLR-16 combines durability with a balanced weight, making it suitable for both professional and sport applications.

Technical specifications

Brand: FAB Defense

Model: GLR-16 black for M4/AR15

Compatibility: M4 / AR15 / M16 platforms

Buffer tube compatibility: Mil-Spec & commercial

System: patented Anti-Rattle mechanism

Material: fiberglass-reinforced polymer

Buttpad: ergonomic rubber, non-slip

Storage: waterproof internal compartment (CR123 / AA batteries)

Sling options:

3 integrated slots

2 ambidextrous rear QD sling mounts (metal)

Upgrade compatibility: adjustable cheek rest (optional)

Weight: approx. 276 g

Dimensions: 180 × 130 × 48 mm

Package contents

1 × FAB Defense GLR-16 black stock

Why choose it
The GLR-16 is not just a cosmetic upgrade — it’s a functional improvement:

eliminates stock wobble (Anti-Rattle system)

adds real utility (battery storage + sling versatility)

enhances shooting stability and control

It’s the right choice for users who want a more refined and reliable setup without compromise.

Warnings & usage information (GPSR compliant)

Ensure compatibility with your buffer tube before purchase.

Install only on an unloaded and safe firearm/replica.

Do not modify or tamper with the product.

Periodically check proper installation and locking.

Keep out of reach of children; not a toy.

Avoid exposure to extreme heat or aggressive chemicals.

Clean using a soft cloth; do not use abrasive solvents.