Magpul ACS-L™ Carbine Stock – Mil-Spec | MAG378

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(3 customer reviews)


The Magpul ACS-L (Adaptable Carbine Stock – Light) Mil-Spec is a drop-in replacement buttstock for AR15/M4 carbines using Mil-Spec sized receiver extension tubes. A streamlined version of the ACS, the ACS-L utilizes the same center storage compartment and cheek weld but removes the battery tubes for a slimmer, lighter weight package.

Made in the USA.


Sloping cheek weld provides a wide contact surface for user comfort


Mounts on Mil-Spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others (please see the note below). 

Storage compartment in tail of stock with positive latching access door on right hand side


Supplemental friction lock minimizes accuracy robbing wobble*. Shielded release latch prevents snagging and accidental operation 


Replaceable rubber 0.3″ Rubber Butt-Pad offers an anti-slip surface and increases impact protection


Compatible with Magpul ASAP®, ASAP® QD, and other receiver-mount sling attachments 

Sling Mounts:

Mid – Included reversible Sling Mount Kit -TYPE 3 fits up to 1.5″ push-button swivels (swivel not included)

Rear/Bottom – 1.00″ sling loop


Premium chrome-silicon lock spring provides positive locking and long service life


Export Administration Regulations Controlled Product

EXPORT NOTICE: This is an item controlled for export by the Export Administration Regulations (EAR) under the Commerce Control List (CCL). These controls take the form of export regulations and license requirements. As part of the express consideration provided for receipt of Magpul’s goods, technical data and/or services, you, our customer, acknowledge that the export, re-export or other transfer, directly or indirectly, of the goods, technical data and/or services provided by Magpul in violation of U.S. law is prohibited. Customers acquiring controlled goods, technical data and/or services from Magpul shall be responsible for obtaining any necessary U.S. or other government authorization required to ensure compliance with applicable export laws. (See Magpul Shipping and Returns FAQ for more information).

WARNING: Observe safe firearm handling practices at all times. Failure to do so may result in serious bodily injury or death. Magpul Industries shall not be responsible for injury, death, or property damage resulting from faulty installation, misuse, illegal use, or modification of this product.


More Information
Platform AR10, AR15, M4, M16, M110, SR25
Compatibility Mil-Spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others
LOP, M4 Collapsed ~11.6 in.
LOP, M4 Extended ~14.9 in.
LOP Adjustment Range 3.3 in.
Length, max 8.0 in.
Weight 12.5 oz.
Weight, w/ receiver extension 16.5 oz.
Width, max 2.2 in.
Other Specs * Friction lock performance may vary depending on the host receiver extension’s dimensional tolerances.

** Specifications based on standard-length (flat-back) M4 Carbine Receiver Extension and may vary depending on tube manufacturer.

Additional information

Weight 12.804448198989 oz
Dimensions 8 × 6 × 2 in

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3 reviews for Magpul ACS-L™ Carbine Stock – Mil-Spec | MAG378

  1. chrisc429 (verified owner)

    Not bad for magp

  2. chrisc429 (verified owner)

    Not bad

  3. blaum3 (verified owner)

    Great all around stock, tight fit on the buffer tube, another great product from Magpul.

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