Magpul ACS-L Carbine Stock FDE Synthetic for AR-15/M16/M4 (Mil-Spec Tube Not Included)

The Magpul ACS-L carbine stock is a streamlined take on Magpul's proven ACS design, engineered for shooters who want the essentials without the bulk. Built from durable synthetic material in flat dark earth (FDE), this mil-spec stock pairs lightweight construction with the ergonomic features that made the original ACS a favorite among AR-15 and M4 carbine owners. If you run a modern tactical rifle, hunting carbine, or competition gun and value maneuverability without sacrificing comfort behind the gun, the ACS-L delivers a no-nonsense platform that works hard without getting in the way.

The design philosophy here is clear: Magpul stripped away the side storage compartments that added weight and bulk to the standard ACS, while keeping the features that actually matter. The wide, sloping top surface provides a solid, comfortable cheekweld—critical for consistency whether you're shooting prone, from barriers, or in tight quarters. The rear compartment is still there for storing small essentials, and the integrated friction-locking mechanism keeps the stock solidly in place once extended, with no rattle or creep under recoil.

Sling mounting options are built in: the stock includes a reversible QD (quick-detach) socket for standard push-button sling swivels, plus a 1-inch molded sling loop at the toe. The rubber recoil pad is a substantial 0.3 inches thick and can be swapped out for Magpul Tactical Recoil Pads if you want to customize the feel. This is a mil-spec tube stock, meaning it fits standard 1.14-inch buffer tubes found on most direct-impingement ARs—just note that you'll need to source your own tube, buffer, receiver extension nut, and action spring separately.

Whether you're building a dedicated precision rifle, a lightweight carbine for hunting, or upgrading an existing platform, the ACS-L gives you the kind of refined, purpose-built interface that Magpul is known for—no compromises on usability, no gimmicks.

Key Features

• Lightweight design with side storage compartments removed for reduced profile
• Wide, sloping cheekweld surface for secure, repeatable shouldering
• Rear storage compartment for stowing gear or supplies
• Friction-locking mechanism prevents stock wobble after extension
• Reversible QD socket for quick-detach sling swivels
• Integrated 1-inch sling loop at toe of stock
• 0.3-inch rubber recoil pad (replaceable with Magpul Tactical Recoil Pads)
• Flat dark earth (FDE) synthetic construction
• Fits mil-spec (1.14" O.D.) carbine buffer tubes

Specifications

Frequently Asked Questions

Will this stock fit my AR-15 or M4 carbine?

Yes, the ACS-L is designed for AR-15, M16, and M4 platforms. It requires a mil-spec carbine buffer tube with a 1.14-inch outer diameter. If your rifle uses a mil-spec tube, you're good to go—just remember you'll need to source the tube, buffer, receiver extension nut, and action spring separately if you don't already have them.

What's the difference between the ACS-L and the standard ACS?

The ACS-L is the lightweight, streamlined version. Magpul removed the side storage compartments to reduce weight and profile, while keeping the cheekweld geometry, rear compartment, friction-locking mechanism, and sling-mounting features that made the original ACS popular.

Can I replace the recoil pad?

Yes. The stock ships with a 0.3-inch rubber recoil pad that can be swapped out for Magpul Tactical Recoil Pads, which are sold separately.

What comes in the box, and what do I need to source separately?

The stock itself is included along with the QD socket and sling loop. You will need to provide your own mil-spec carbine buffer tube, carbine buffer, receiver extension nut, and action spring to complete the installation.