FAB Defense GLR-16 Buttstock — Black Polymer with Fixed Storage Compartment & Anti-Rattle Mechanism for AR-15 / M16 / M4 (Model FXGLR16B / UPC 7290105940681)
Upgrade your AR-platform with a mission-ready stock that improves ergonomics, reduces noise, and stores essentials on the go. The FAB Defense GLR-16 Buttstock (FXGLR16B) is an adjustable, high-strength polymer buttstock engineered for AR-15, M16 and M4 rifles that combines an anti-rattle clamping mechanism with a built-in fixed storage compartment—delivering quiet, repeatable cheek welds and practical carry space for batteries, small tools, or survival items. Rugged, lightweight, and ergonomically refined, the GLR-16 is a premium drop-in upgrade for duty weapons, competition rigs, and everyday carry carbines.
Why the GLR-16 is a smart upgrade
Whether you’re building a duty rifle, competition AR, or a versatile range gun, the GLR-16 brings three critical improvements in one compact package:
Anti-rattle mechanism — clamps solidly to the buffer tube to eliminate stock wobble and distracting movement.
Fixed storage compartment — conveniently houses small essentials (battery, spare parts, or cleaning tools) without increasing bulk or altering balance.
Ergonomics — contoured cheek weld, textured buttpad, and adjustable length of pull for a comfortable, repeatable shooting position.
These features combine to increase shooter confidence, decrease setup time, and make the rifle quieter and more dependable in the field.
Key Features & Benefits
Model / UPC: FXGLR16B / 7290105940681
Compatibility: Fits mil-spec and many commercial AR-15 / M16 / M4 buffer tubes (verify fit before purchase).
Material: High-strength reinforced polymer for lightweight durability and impact resistance.
Color / Finish: Matte black — non-reflective, tactical aesthetic.
Anti-Rattle Mechanism: Integrated clamping system secures the stock to the buffer tube, eliminating wobble and noise for a rock-solid cheek weld and repeatable zeroing position.
Fixed Storage Compartment: Internal, non-removable cavity sized for small items (CR123/AA/AAA battery options depending on spacer use, spare firing pin spring, small multi-tool bits) with a secure closure to prevent loss during movement.
Length of Pull Adjustment: Multi-position adjustment for comfortable fit with or without body armor and for shooters of different statures.
Comfort Features: Ergonomic cheek weld and textured rubber buttpad for recoil mitigation and secure shoulder purchase.
Ambidextrous Sling Options: QD sockets and sling loop compatibility provide flexible carry and transition options.
Anti-Slip Buttpad: Textured, rubberized base reduces slippage and improves control during rapid fire.
Low-Profile Design: Keeps overall dimensions compact for mobility and storage while preserving a full-feature stock.
Easy Installation: Drop-in replacement—installs quickly with common tools; no permanent modifications required.
Design & Engineering Details
Precision Fit: The GLR-16’s anti-rattle clamp uses a firm mechanical lock to press the stock evenly against the buffer tube, preventing the lateral or rotational play common in older, looser stocks. This increases consistency for optics and repeatable shoulder position.
Accessible Storage: The fixed compartment was thoughtfully sized and positioned to keep stored items from rattling and to maintain natural balance—no wobble, no extra bulk. The compartment is secured within the stock’s body and protected from the elements and snag hazards.
Comfort-Centered Geometry: The cheek weld geometry is engineered to align with common red-dot and magnified optics, improving sight acquisition and reducing fatigue on long sessions. The buttpad distributes recoil evenly and reduces perceived impulse.
Durability: Reinforced polymer resists impacts, solvents, and temperature extremes while keeping weight low relative to metal stocks.
Performance & Practical Use
Tactical / Duty: Gives patrol officers and operators a quiet, solid shoulder interface that won’t rattle during movement or transitions. Storage compartment is perfect for a spare optic battery or small essential tools.
Competition: Repeatable cheek weld and adjustable LOP help shooters maintain consistent sight picture and faster transitions.
Hunting & Outdoors: Lightweight durability stands up to field conditions; storage compartment lets you carry small survival items without adding an external pouch.
Range & Training: Reduces distractions from stock play and keeps small replacement parts on hand for quick fixes.
Installation & Fitment (High-Level)
Ensure Safety: Verify the rifle is unloaded and clear.
Remove Existing Stock: Loosen and remove the grip screw or stock hardware per your rifle’s manual.
Slide On GLR-16: Position the GLR-16 over the buffer tube and align the anti-rattle clamp with the receiver extension.
Secure Clamp: Tighten the clamp/screw until the stock is firmly seated and free of movement—do not over-torque.
Adjust LOP: Set the length of pull to your preference and confirm cheek weld with your optic.
Function Check: Verify selector and trigger function have not been impeded. Conduct a live-fire zeroing session to ensure consistent point of impact.
If you are not comfortable installing firearm components, have a qualified armorer or gunsmith perform the installation.
Technical Specifications (At-a-Glance)
Manufacturer: FAB Defense
Model: GLR-16 Buttstock (FXGLR16B)
UPC: 7290105940681
Compatibility: AR-15 / M16 / M4 (Mil-Spec & many commercial buffer tubes)
Material: Fiberglass-reinforced polymer (high-strength composite)
Color: Black (matte)
Features: Anti-rattle clamp, fixed internal storage compartment, adjustable LOP, rubber buttpad, QD sling sockets
Weight: Lightweight (manufacturer tolerance applies)
Installation: Drop-in with clamp/screw (no permanent modification required)
Care & Maintenance
Cleaning: Wipe down with a damp cloth to remove dirt and residue. Mild soap is safe for polymer finishes.
Inspection: Periodically verify clamp screw torque and check the compartment closure for debris. Inspect for cracks or damage after heavy impacts.
Avoid Harsh Solvents: While the polymer is solvent-resistant, avoid prolonged use of aggressive chemicals that may degrade finishes or stored items.
Frequently Asked Questions (FAQ)
Q: Will the GLR-16 fit my commercial buffer tube?
A: The GLR-16 is designed for Mil-Spec tubes and many commercial tubes; verify tube diameter and intended fit before purchase. Some commercial tubes use slightly different dimensions—check FAB Defense compatibility notes or measure your tube to confirm.
Q: What fits in the fixed storage compartment?
A: The compartment is intended for small essentials such as optic batteries (check exact battery size for fit), spare springs, small multi-tool bits, or emergency matches. It’s fixed (non-removable) to preserve structural strength.
Q: Does the anti-rattle clamp require periodic retightening?
A: Like any mechanical interface, it’s wise to check torque after initial installation and periodically thereafter—especially after heavy use or long transports.
Q: Is this stock legal in my area?
A: Stock legality varies by jurisdiction. Ensure compliance with local laws and regulations before modifying or reconfiguring firearms.
SEO-Friendly Product Summary
The FAB Defense GLR-16 Buttstock (FXGLR16B) is a rugged black polymer buttstock for AR-15, M16, and M4 rifles featuring an anti-rattle clamping mechanism and a fixed internal storage compartment for batteries and small tools. With an ergonomic cheek weld, adjustable length of pull, QD sling sockets and a textured rubber buttpad, the GLR-16 improves shooting comfort, reduces stock wobble, and adds practical on-gun storage—making it an ideal upgrade for duty, competition, and field rifles. Model FXGLR16B / UPC 7290105940681.
Refine your rifle’s ergonomics, silence the rattle, and carry the essentials where you need them — the FAB Defense GLR-16 Buttstock is a compact, durable, and feature-rich solution for modern AR builds.
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