Magpul ACS Mil-Spec AR-15 Carbine Stock Gray
Magpul Industries
$90.20
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Magpul Industries
Magpul ACS Mil-Spec AR-15 Carbine Stock Gray
The Magpul ACS Mil-Spec AR-15 Carbine Stock in Gray is a purpose-built, drop-in buttstock that combines the rock-solid lockup of Magpul's acclaimed CTR design with versatile on-board storage — making it one of the most practical upgrades available for mil-spec AR-15 and M4 carbine platforms.
- Drop-in fit for any mil-spec sized AR-15/M4 receiver extension tube
- Dual rear-accessible, water-resistant battery storage tubes keep essentials secure
- Integral butt compartment offers additional storage for batteries, tools, or supplies
- Anti-snag QD release latch prevents accidental stock deployment during use
- Supplemental friction lock system eliminates stock wobble for improved accuracy
- 0.30" rubber butt-pad delivers positive shoulder purchase over body armor or gear
Who This Is For
The Magpul ACS is ideal for AR-15 owners who want more than a standard collapsible stock — whether you're a competition shooter who needs a stable, wobble-free platform, a home-defender who wants a snag-free stock in tight quarters, or a tactical user who demands on-body storage for batteries, CLP patches, or backup gear. It's an excellent choice for anyone already running a mil-spec buffer tube who wants a meaningful, tool-free upgrade without swapping out their lower receiver extension.
Specifications
| Brand | Magpul Industries |
|---|---|
| Model | ACS (Adaptable Carbine/Storage) – Mil-Spec |
| Color | Gray |
| Compatible Platform | AR-15 / M4 Carbine (Mil-Spec receiver extension) |
| Tube Size | Mil-Spec (1.14" diameter) |
| Butt-Pad Thickness | 0.30 in. rubber |
| Storage | 2 water-resistant battery tubes + integral butt compartment |
| Locking System | Friction lock + anti-snag QD release latch |
| Material | Reinforced polymer |
| Installation | Drop-in, no gunsmithing required |
Frequently Asked Questions
Will the Magpul ACS fit my AR-15's existing buffer tube?
The ACS Mil-Spec model is designed to fit standard mil-spec receiver extension tubes with a 1.14-inch outer diameter — the most common spec found on AR-15 and M4-style carbines. It is not compatible with commercial-spec buffer tubes, which have a slightly larger diameter and different taper. If you're unsure which tube you have, measure the outer diameter or check your lower receiver/stock manufacturer's documentation before ordering.
What can I store in the ACS stock's compartments?
The ACS features two rear-accessible, water-resistant storage tubes sized to hold standard CR123A or AA batteries — perfect for keeping spares for weapon lights, optics, or night-vision devices on hand. The integral butt compartment can accommodate small tools, a cleaning patch, CLP wipes, or other flat, compact items. While the storage is practical and weather-resistant, the compartments are not fully waterproof, so plan accordingly for submersion or heavy rain exposure.
How does the ACS compare to the Magpul CTR stock?
The Magpul ACS and CTR share the same core locking mechanism — including the friction lock system and anti-snag release latch — so both deliver the same tight, wobble-free fit on mil-spec buffer tubes. The key difference is that the ACS adds on-board storage (battery tubes and butt compartment), which adds a small amount of weight and bulk. If you prioritize a lightweight, low-profile stock, the CTR is the leaner choice; if on-body storage is a priority, the ACS delivers it without sacrificing lockup quality.
