Description
FAB Defense built its reputation designing gear for military and law enforcement units overseas, and this GL-Core M plus Gradus combo brings two of its most useful AR15 accessories together in one Flat Dark Earth package. Instead of picking a stock and a grip separately and hoping the tones match, you get a coordinated upgrade that adds real function along with a cleaner look on your rifle.
The GL-Core M buttstock is the standout piece here. It's built around a concealed magazine carrier that holds a spare 10-round AR mag right inside the stock body, so you're never more than a few inches from a reload if your primary mag runs dry or gives you trouble. The rubberized, multi-textured buttpad locks into your shoulder for a stable cheek weld, and it ships with an interchangeable buffer tube adapter so it drops onto either Mil-Spec or Commercial tubes without extra parts to track down. Ambidextrous QD sling swivel sockets are molded right into the stock, and the whole thing is made from fiberglass-reinforced polymer to handle drops, weather, and the kind of use that gear actually sees at the range or in the field.
Rounding out the GL-Core M and Gradus pairing is the Gradus grip, a compact M-LOK foregrip that mounts flush to any M-LOK handguard slot. It's designed to work as either a stubby foregrip or a hybrid C-clamp style hold, and the slightly reduced grip angle takes pressure off your wrist during longer range days. The rubberized, multi-textured surface stays grippy whether your hands are sweaty, cold, or wet, which matters more than people think once you're a few boxes of ammo into a session.
Together, this GL-Core M and Gradus set gives you a meaningful upgrade over stock AR15 furniture, both in what it does and how it feels in your hands. It's a straightforward way to add mag storage, better shouldering, and improved grip control in one matched color scheme.
Key Specifications
- Manufacturer: FAB Defense
- Manufacturer Part Number: FXAR15KITT
- UPC: 7290111588402
- Color: Flat Dark Earth (FDE)
- Kit Components: GL-Core M buttstock, Gradus M-LOK forward grip
- Buttstock Compatibility: Mil-Spec and Commercial buffer tubes
- Grip Mounting: M-LOK compatible handguards
- Platform Compatibility: AR15 / M16 / M4
- Caliber: 5.56x45mm NATO / .223 Remington
- Stock Material: Fiberglass-reinforced polymer with rubber overmold
- Magazine Storage: Integrated carrier fits one spare AR magazine (includes 10-round Ultimag)
- Sling Attachment: Ambidextrous, integrated QD sling swivel sockets
- Grip Style: Stubby / hybrid C-clamp forward grip
What’s Included
- FAB Defense GL-Core M buttstock with built-in magazine carrier (FDE)
- One FAB Defense Ultimag 10-round AR magazine
- Interchangeable buffer tube adapter for Mil-Spec and Commercial tubes
- FAB Defense Gradus M-LOK forward grip (FDE)
Frequently Asked Questions
What comes in the FAB Defense AR15 GL-Core M and Gradus kit?
This kit pairs the GL-Core M buttstock with the Gradus M-LOK forward grip, both finished in matching Flat Dark Earth. The stock arrives with its buffer tube adapter and a 10-round Ultimag already included, so you're not hunting down extra parts to get it installed.
Will the GL-Core M stock fit my buffer tube?
Yes, it comes with an interchangeable adapter that lets it lock onto either Mil-Spec or Commercial buffer tubes. Just make sure you install the correct adapter for your tube type before you tighten everything down.
Can I use a full-size 30-round magazine in the GL-Core M stock instead of the 10-round mag it comes with?
The carrier is sized around a compact 10-round magazine, which is what keeps the stock from feeling front-heavy or awkward on your shoulder. You technically can slot in a larger mag, but anything beyond 10 rounds adds noticeable bulk and weight to the back of your rifle.
Does the Gradus grip need a specific handguard to install?
The Gradus grip mounts directly to any M-LOK slot, so as long as your handguard has M-LOK compatible attachment points you're good to go. No rail adapter or extra hardware needed beyond what's included with the grip.





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