FAB Defense GL-CORE M CP AR-15/M4 Stock with Magazine Carrier & Adjustable Cheek Rest

FAB Defense GL-CORE M CP AR-15/M4 Stock with Magazine Carrier & Adjustable Cheek Rest

The FAB Defense GL-CORE MAG CP combines three functions in one AR-style stock: collapsible length-of-pull adjustment, an integrated spare-magazine carrier, and an adjustable cheek rest. It is designed for AR-15, M4, and other compatible platforms using a carbine-style receiver extension, giving the shooter more control over stock fit while keeping an additional magazine attached directly to the rifle.

The CP configuration builds on the standard GL-CORE M by adding an adjustable cheek piece above the stock body. This gives the shooter a higher and more repeatable cheek position for use with optics while retaining the onboard magazine storage that distinguishes the GL-CORE MAG family from the standard GL-CORE.

Key Features

• Integrated spare magazine carrier
• Adjustable cheek rest
• Collapsible AR-style stock with adjustable length of pull
• Designed for AR-15, M4, and compatible platforms
• Compatible with MIL-SPEC and commercial-pattern carbine receiver extensions
• Interchangeable tube adapters for proper fit
• Broad cheek-weld surface
• Rubberized buttpad for secure shoulder contact
• Inverted adjustment lever helps reduce accidental activation
• Integrated sling attachment provisions
• Reinforced polymer construction
• Available in Black, OD Green, and Flat Dark Earth

Integrated Magazine Carrier

The GL-CORE MAG CP incorporates a dedicated magazine carrier into the rear stock assembly. This allows a compatible spare magazine to remain with the rifle rather than relying entirely on a separate pouch, chest rig, or other load-bearing equipment.

The carrier is part of the stock design rather than an add-on attached to the receiver extension. For users comparing this model with the standard GL-CORE CP, the integrated magazine storage is the major functional difference.

Adjustable Cheek Rest

The CP version adds an adjustable cheek rest above the GL-CORE stock body. Raising the cheek piece can help align the shooter's eye more consistently with an optic mounted above the receiver, particularly when using taller optic mounts or configurations where the standard stock comb sits lower than preferred.

The cheek rest and collapsible stock address two different dimensions of rifle fit. The receiver extension controls overall length of pull, while the cheek piece adjusts the vertical support position for the shooter's head.

Collapsible Stock Configuration

The GL-CORE MAG CP moves along a compatible carbine receiver extension, allowing the overall stock length to be adjusted for shooter proportions, clothing, equipment, or shooting position. The stock retains the broad rear profile and rubberized buttpad found throughout the GL-CORE family.

This makes the MAG CP more configurable than a basic M4-style stock while maintaining the familiar collapsible architecture of an AR-pattern carbine.

MIL-SPEC and Commercial Tube Compatibility

FAB Defense uses interchangeable adapters that allow the GL-CORE MAG CP to fit both MIL-SPEC and commercial-pattern carbine receiver extensions. Buyers should determine which receiver-extension specification is installed on their firearm and use the corresponding adapter for proper fit.

Charging Handle Clearance

Important Fitment Note: On AR-15 and M4-pattern rifles, an elevated cheek rest can affect charging-handle clearance depending on the stock position and cheek-rest setting. After installation, the user should confirm that the charging handle can travel through its complete range without contacting the cheek piece.

This should be checked whenever the cheek-rest height or stock position is changed.

Product Specifications

• Manufacturer: FAB Defense
• Model: GL-CORE MAG CP
• Type: Collapsible Stock with Magazine Carrier & Adjustable Cheek Rest
• Primary Platform: AR-15 / M4 and Compatible Platforms
• Receiver Extension Compatibility: MIL-SPEC and Commercial Carbine Tubes
• Cheek Rest: Adjustable
• Length of Pull: Adjustable
• Magazine Storage: Integrated Rear Magazine Carrier
• Buttpad: Rubberized
• Construction: Reinforced Polymer

Color Variants

• Black: FX-GLCOREMAGCPB | UPC 7290111586552
• OD Green: FX-GLCOREMAGCPG | UPC 7290111586569
• Flat Dark Earth: FX-GLCOREMAGCPT | UPC 7290111586576

Compatibility Note: Buyers should verify receiver-extension fit, charging-handle clearance, and magazine compatibility with their exact firearm configuration before use.

GL-CORE M vs. GL-CORE M CP

The standard GL-CORE M provides collapsible stock adjustment and integrated spare-magazine storage. The GL-CORE M CP retains those features and adds the adjustable cheek rest. For rifles using magnified optics or elevated sighting systems, the CP version provides additional control over head position without giving up the onboard magazine carrier.

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