The FAB Defense GLR-16 Buttstock (brand part no. FXGLR16B) is a fixed stock built for AR-15, M16, and M4-pattern rifles that need extra length of pull and onboard storage without added complexity. A patented anti-rattle mechanism locks the stock firmly onto Mil-Spec or commercial buffer tubes, eliminating the wobble common to cheaper aftermarket stocks. Inside, a water-resistant compartment holds two CR123 or AA batteries, keeping spares on the gun instead of in a range bag. Three integrated sling slots, one up front and two at the rear, give shooters flexible carry options, and a rubber butt pad keeps the stock planted on the shoulder shot after shot.

Key Specifications

• Fits both Mil-Spec and commercial buffer tubes thanks to a patented anti-rattle mounting mechanism.
• Built from fiberglass reinforced polymer composite for a durable, lightweight stock.
• Includes a water-resistant storage compartment that holds two CR123 or AA batteries.
• Features three integrated sling attachment slots, one forward and two at the rear, for flexible carry setups.
• A rubber butt pad keeps the stock seated on the shoulder for stable, repeatable shouldering.
• Finished in black to match standard AR furniture.

Frequently Asked Questions

Will this fit my buffer tube? Yes, the anti-rattle mounting mechanism works with both Mil-Spec and commercial buffer tubes.

Can I store spare batteries in the stock? Yes, a water-resistant compartment inside the stock holds two CR123 or AA batteries.

How many sling attachment points does it have? Three: one at the front of the stock and two at the rear.

Buy the FAB Defense GLR-16 Buttstock for AR-15/M16/M4, Black

A fixed stock that carries spare batteries and gives you real sling options is an easy upgrade for any AR-15, M16, or M4 build. Browse more AR stocks and braces and order from a Lubbock, TX gun shop.