The Magpul ACS-L is a mil-spec carbine stock with onboard battery storage for AR-15 and M4 rifles, fitting any Mil-Spec-diameter receiver extension.
The Magpul ACS-L Carbine Stock (MAG378) — Adaptable Carbine/Storage, Light — streamlines the full ACS concept for shooters who want its wobble-resistant stability and onboard battery storage without the width and weight of the flagship. The friction-lock interface still clamps the stock firm against the receiver extension for a stable, repeatable cheek weld; the storage slims down to efficient battery tubes rather than full compartments.
The slimmer housing handles faster and clears gear more cleanly, while the rubber buttpad and reinforced polymer construction are standard Magpul fare. It is the pragmatic middle path of the stock line — most of the capability, noticeably less of the mass.
Key Features
- Friction-lock stability: a firm, wobble-resistant weld
- Streamlined battery storage: essentials onboard, bulk offboard
- Slimmer, lighter housing: faster handling than the full ACS
- Rubber buttpad: positive shoulder contact
- Three finishes: Black, Flat Dark Earth, Olive Drab Green
Compatibility & Fitment
Fits AR-15/M4 rifles with a Mil-Spec-diameter carbine receiver extension (buffer tube). Commercial-diameter tubes are slightly larger and will not take it, so check your tube specification before you buy — if you are not sure which you have, measure the tube or contact us with your rifle's make and model. Slide on, set length, engage the lock; battery tubes load from the rear.
Technical Specifications
Platform | AR-15 / M4 |
Fits | Mil-Spec carbine receiver extension |
Type | Collapsible carbine stock with battery storage tubes |
Material | Reinforced polymer |
Finish | Black, Flat Dark Earth, Olive Drab Green |
Adjustment | Friction lock |
US Shipping & Support
Shipped from D&R Sports Center in the USA with fast, tracked delivery. Questions on fit, mounting or which model suits your setup? Our team is glad to help before and after your purchase.
Frequently Asked Questions
Will the ACS-L fit my buffer tube?
It is made for AR-15/M4 rifles with a Mil-Spec-diameter carbine receiver extension. Commercial-diameter tubes are slightly larger and will not take it, so check your tube specification before you buy. If you are not sure which you have, measure the tube or contact us with your rifle's make and model.
What does the L in ACS-L mean in practice?
The ACS-L is the slimmer, lighter version of the ACS: it keeps battery storage but uses streamlined tubes rather than the fuller compartments of the standard stock. That gives a less bulky stock that still carries a few essentials. If storage volume matters more than profile, look at the standard ACS (MAG370).
What is the storage like?
It has battery storage tubes built into the body, sized for small items rather than bulky spares. They are closed off within the stock so contents are not rattling loose on the rifle. Check what you intend to carry will physically fit before relying on it.
Which finish, and what do I need to fit it?
Black, Flat Dark Earth and Olive Drab Green are available, all identical apart from color. Swapping a carbine stock is usually just a matter of releasing the adjustment lever and sliding the old stock off the tube, so no special tooling is normally involved.
