FAB Defense GLR-16 Matte Black Synthetic Fixed Storage Compartment & Anti-Rattle Mechanism for M4/AR-Platform

The FAB Defense GLR-16 is a fixed AR-15 buttstock built for shooters who want practical storage and a secure cheek weld without the complexity of a collapsible system. This matte black synthetic stock fits both mil-spec and commercial diameter buffer tubes, so whether you're running a factory tube or an aftermarket upgrade, the GLR-16 will drop right in. It's purpose-built for AR platform rifles and M4-style carbines—the kind of gun that lives in your truck, your safe, or on your next hunting trip.

What sets the GLR-16 apart is the integrated battery compartment tucked inside the stock body. A water-resistant sealed space holds two CR-123A or AA batteries—essential for keeping spares dry and accessible when you need them for your optics, lights, or other gear. The anti-rattle design keeps everything quiet during transitions and movement. Add in the built-in sling attachment points—one forward slot and two rear slots, plus two ambidextrous QD sling sockets—and you've got a stock engineered for working rifles, not bench guns.

The rubberized butt pad is contoured for a stable, repeatable shoulder position whether you're at the range or in the field. For hunters, tactical shooters, and AR enthusiasts who value durability and functionality over adjustability, the GLR-16 is a no-nonsense upgrade that handles the job.

Key Features

• Fits both mil-spec and commercial diameter buffer tubes
• Water-resistant sealed storage compartment for batteries or small items
• Anti-rattle mechanism minimizes noise during carry and movement
• Rubberized butt pad for stable shoulder positioning
• Four total sling attachment options: one forward slot, two rear slots, and two QD sockets
• Fixed design—no collapse adjustment needed
• Matte black finish

Specifications

Frequently Asked Questions

Will the GLR-16 fit my AR-15?

Yes. The GLR-16 is designed for AR platform rifles and fits both mil-spec and commercial diameter buffer tubes, which covers the vast majority of AR-15 and M4-style builds.

What can I store in the battery compartment?

The compartment holds two CR-123A or AA batteries. It's water-resistant, making it ideal for keeping spare batteries dry for optics, weapon lights, and other gear.

Can I attach a sling to this stock?

Yes. The GLR-16 includes one front sling slot, two rear sling slots, and two ambidextrous QD sling sockets, giving you multiple mounting options to match your preferred sling setup.

Is the stock adjustable or fixed?

The GLR-16 is a fixed stock—it does not collapse. If you need a collapsible option, you'll want to look at a different platform.