Description
The GL-CORE CP is FAB Defense's take on a do-it-all AR-15 carbine stock, and it earns its keep. You get an integrated cheek weld, a rubberized butt-pad shaped for fast shouldering, and a compact profile with no sharp edges to snag on a sling or your gear. The standout is the add-on GCCP cheek rest, a three-position riser that clips on when you want a taller, more repeatable cheek weld behind higher-mounted optics or magnifiers.
What Sets the GL-CORE CP Apart
The whole thing is molded from fiberglass reinforced polymer, so it shrugs off knocks and weather without adding a bunch of heft to the back of your rifle. Two integrated quick-detach rear sling swivel sockets are built right in, giving you clean ambidextrous mounting points for a QD sling. FAB Defense also built in an inverted length-of-pull lever that sits flush and resists getting bumped open when you least want it, which is a nice touch on a working gun.
Fitment on the GL-CORE CP
One of the best parts of this stock is the interchangeable tube adapters. It ships ready to run on either Mil-Spec or Commercial buffer tubes, so you don't have to measure twice or guess about your setup. Installation is quick: extend the length of pull, lift the retention tab, and slide it off or on. Most folks find it locks up tight with minimal wobble once seated.
Getting the Most From the Cheek Riser
Worth knowing before you build: the CP cheek riser was really designed with AK and VZ platforms in mind, where higher optic mounts call for a taller comb. On an AR with low-mounted optics, that riser can push your eyeline up too high for a clean sight picture, and it may crowd the charging handle when the stock is collapsed. The good news is the riser clips on and off in seconds, so you can run the stock bare for AR duty and add the comb when a build calls for it. That flexibility is exactly why the CP version makes sense for people who bounce between platforms.
Key Specifications
- Manufacturer: FAB Defense
- Manufacturer Part Number: FX-GLCORECPG
- UPC: 7290111581847
- Color: OD Green
- Platform: AR-15 / M4 (AK and VZ with cheek rest)
- Material: Fiberglass reinforced polymer composite
- Buffer Tube Fit: Mil-Spec and Commercial (interchangeable adapters)
- Cheek Rest: Three-position adjustable (removable)
- Sling Mount: Two integrated QD rear sling swivel connectors
- Weight: Approx. 398 g / 0.99 lb shipping
- Length: 180 mm
- Width: 55 mm
- Height (closed): 153 mm
- Height (deployed): 171 mm
What’s Included
- GL-CORE CP buttstock (OD Green)
- Mil-Spec buffer tube adapter
- Commercial buffer tube adapter
- GCCP three-position cheek rest
- Allen wrench for cheek rest installation
Frequently Asked Questions
Does the GL-CORE CP fit both Mil-Spec and Commercial buffer tubes?
Yes. It comes with interchangeable tube adapters that let it clamp securely to either diameter, so you don't need to know your tube spec before ordering. Just install the correct adapter for your setup and slide the stock on. Most users report a tight, low-wobble fit once seated.
Is the cheek rest better suited for AR-15s or AK-pattern rifles?
The three-position cheek rest was primarily designed for AK and VZ platforms, where higher optic mounts benefit from a taller comb. On an AR-15 running low-mounted optics, the riser can raise your eyeline too high for a clean sight picture and may crowd the charging handle when collapsed. The good news is it clips on and off in seconds, so you can run the stock bare on your AR and add the comb only when a build calls for it.
How hard is the GL-CORE CP to install?
Installation is quick and requires no gunsmith. Extend the length of pull fully, lift the retention tab to drop the internal post, then slide the stock onto your buffer tube. The cheek rest attaches with the included Allen wrench if you choose to run it.
Does it have built-in sling attachment points?
It does. The GL-CORE CP has two integrated quick-detach rear sling swivel sockets, giving you ambidextrous QD mounting without adding an aftermarket sling plate. Pair it with a good QD sling and you're set for a one or two-point carry.





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