The Magpul ACS (Adaptable Carbine Stock) is a premium, feature-rich collapsible stock designed to enhance the ergonomics, comfort, and storage capabilities of your AR-15 or M16 rifle. Built to fit mil-spec buffer tubes, this stock combines superior cheek weld support, integrated storage, and a solid lock-up in a rugged design trusted by law enforcement, military, and serious shooters.
Whether you’re running an AR-15 for tactical use, sport shooting, or duty work, the Magpul ACS stock adds a high-performance edge. With dual water-resistant battery storage tubes, a sloping cheek weld surface, and anti-snag design, the ACS balances modern utility with Magpul’s proven durability.
Its friction-lock mechanism eliminates wobble on the buffer tube, offering a stable shooting platform, while the sloped rubber butt-pad provides recoil absorption and a secure shoulder fit—even when wearing body armor.
Designed to fit mil-spec carbine receiver extension tubes
Compatible with most AR-15, M4, and M16 platforms
No special tools required – drop-in ready
Slim profile with angled surface for consistent cheek placement
Improves comfort and shooting accuracy during extended use
Dual, water-resistant battery storage compartments
Sealed caps prevent moisture and debris intrusion
Ideal for AA, CR123, or other mission-critical batteries
Internal friction lock system eliminates rattle or movement
Provides a rock-solid feel on the buffer tube
Chrome-silicon lock spring for long-term durability
Rubber butt-pad for anti-slip shouldering
Sloped for comfort and armor-friendly fit
Streamlined contours reduce snagging on gear or slings
| Feature | Details |
|---|---|
| Brand | Magpul Industries |
| Model | ACS (Adaptable Carbine Stock) |
| Tube Compatibility | Mil-Spec Carbine Buffer Tube |
| Material | Reinforced Polymer |
| Color | Black (Other finishes available: FDE, OD Green, etc.) |
| Storage | Dual battery compartments |
| Cheek Weld | Sloping enhanced surface |
| Weight | Approx. 14.1 oz (with hardware) |
| Length (Collapsed) | 7.95 in |
| Length of Pull | 11.6″ to 14.9″ (6 positions) |
| Made in the USA | ✅ Yes |
The Magpul ACS Stock is engineered for shooters who demand more than basic function from their gear. With integrated storage, improved ergonomics, and military-grade durability, the ACS is the ideal upgrade for defensive, tactical, or precision builds.
Zero-rattle friction lock ensures consistent shooting platform
Battery storage for optics and lights
Better cheek weld = better shot placement
Tool-free installation on any mil-spec tube
Proudly made in the USA by Magpul
Q: Will this fit a commercial buffer tube?
A: No – this version of the ACS is specifically for mil-spec tubes. A commercial version is available separately.
Q: What kind of batteries fit in the storage tubes?
A: Designed for AA, AAA, or CR123 batteries, ideal for optics or weapon lights.
Q: Does it come with the buffer tube or spring?
A: No – this is the stock only. Buffer tube, spring, and buffer sold separately.
Q: Is this stock adjustable?
A: Yes, the ACS offers 6-position adjustability for custom fit and length of pull.
Upgrade your rifle with Magpul’s ACS Stock and gain enhanced comfort, stability, and smart storage. Trusted by professionals, it’s the ideal choice for any serious AR owner.
Add it to your build today and feel the Magpul difference with every shot.
Also Available :
FAB Defense AR-15 Buttstock – Compact, Cheek Rest, Mil-Spec & Commercial Fit
CMMG Receiver Extension and Stock Kit – A1, Mk3
FAB Defense AR-15 Buttstock with Adjustable Cheek Rest – Fits Mil-Spec & Commercial Buffer Tubes
FAB Defense GL-CORE AR-15 Buttstock – Fits Mil-Spec & Commercial Buffer Tubes
Sylvan Arms Gen4 Folding Stock Adapter – Right Fold for AR10/AR15/AR9
DoubleStar Ace Folding Stock Mechanism with Integrated AR-15 Stock Interface
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