⚠️  CA customers! AB1263 is in effect, learn more here.  ⚠️

ACS® Carbine Stock – Mil-Spec

Holds everything but the kitchen sink

In stock
Only %1 left
SKU
MAG370
$94.95 Regular Price $94.95
$94.95 Regular Price $94.95
add to cart button add to cart button Add To Cart
Select Option
Notify Me
ACS® Carbine Stock – Mil-Spec is available to buy in increments of 1
Be the first to know when this product is available
You're signed up!
  • Magpul Made in the USA Icon MADE & ENGINEERED IN THE USA
  • Magpul Free Shipping Icon FREE SHIPPING on orders over $75
  • Magpul Satisfaction Icon 100% SATISFACTION guaranteed

Product Details

The ACS Carbine Stock offers expanded storage for extra batteries, small parts or gear and includes a lengthened, widened cheek weld for comfort. Water-resistant storage tubes along the cheek weld area hold up to three CR123A or AA batteries each. An additional storage bay near the butt-pad is accessed through a latching compartment door on the right side of the stock. The ambidextrous release latch and friction-lock system provide quick, dependable adjustments that lock down tight and keep the stock in place during hard use.

Made in the USA.

NSN: MAG370-BLK 1005-01-655-8524
NSN: MAG370-ODG 1005-01-591-6070

Features

  • Fits Mil-Spec receiver extensions
  • Adds expanded storage space, including dual storage tubes that hold up to three CR123A or AA batteries each
  • Storage tube plugs are tethered to prevent loss
  • Additional storage bay near the rear of the stock that’s accessible through the right-side latching door
  • Stock profile gives lengthened, wide cheek weld for comfort
  • Ambidextrous release latch for fast adjustments is shielded against unintentional activation
  • Supplemental friction lock system reduces wobble and helps lock stock into place after adjustment
  • Anti-slip rubber butt-pad provides good purchase
  • The included reversible QD cup and footman’s loop provide sling mounting flexibility
  • Compatible with Magpul ASAP®, ASAP® QD, and other receiver-mount sling attachments

AR STOCK WITH STORAGE

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

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

WATER-RESISTANT STORAGE

Two water-resistant battery storage tubes located on the left and right sides of the stock. Each tube will store up to three CR123 lithium or two AA batteries and tubes are accessible from the rear via a tethered, hand-removable rubber plug

PLENTY OF CHEEK WELD

Sloping cheek weld provides a wide contact surface for user comfort

SHIELDED RELEASE LATCH

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

ANTI-SLIP RUBBER BUTT-PAD

Rubber butt-pad offers an anti-slip surface and increases impact protection

SLING POINT VARIETY

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

LONG LASTING ADJUSTABILITY

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

Resources

E.A.R.
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 Compliance Notices page 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.

Technical Specifications

More Information
Collection Collapsible Storage AR Stocks
Platform AR10, AR15, M4, M16, M110, SR25
Compatibility Mil-Spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, LMT, S&W, and others*
LOP, M4 Collapsed ~11.3 in.
LOP, M4 Extended ~14.6 in.
LOP Adjustment Range 3.3 in.
Length, max 7.9 in.
Height, max 5.2 in.
Weight 13.7 oz.
Weight, w/ receiver extension ~17.5 oz.
Width, max 2.6 in.
Width of Butt, max 1.7 in.
Other Specs

*NOTE: There are two basic sizes of M4 Carbine receiver extensions (buffer tubes): Mil-Spec and Commercial-Spec. The ACS Carbine Stock will only fit with the common Mil-Spec tube.

Specifications based on standard-length (flat-back) M4 Carbine receiver extension and may vary depending on tube manufacturer.

Friction lock performance may vary depending on the host receiver extension's dimensional tolerances.

Reviews

Questions

United States © 2026 Magpul Industries Corp. All Rights Reserved.