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The patent-pending MAGPUL ACS Stock is a drop-in replacement butt-stock for carbines using mil-spec or Commercial receiver extension tubes. A streamlined, anti-snag profile shields the release latch to prevent accidental activation and the extra-power lock mechanism uses a premium chrome-silicon spring to avert auto-collapse failure by resisting spring relaxation. Similar to the MAGPUL ACS Stock also features a supplemental friction lock system that minimizes wobble for enhanced weapon stability and accuracy. Dual, rear accessible, water-resistant battery storage tubes and an integral storage compartment in the butt of the stock provides multiple storage options. The MAGPUL ACS Stock comes standard with a 0.30 inch thick rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear.

NOTE: There are two basic sizes of M4 Carbine receiver extensions (buffer tubes): mil-spec or commercial-spec. If you have a commercial-spec extension on your rifle, make sure to order the Commercial-Spec ACS. Please see the “Related Info” section above to determine which tube you have.

MAGPUL ACS Stock Features

Mounts on military-spec or Commercial receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others
Supplemental friction lock minimizes accuracy robbing wobble
Premium chrome-silicon lock spring provides positive locking and long service life
Sloping cheek weld provides a wide contact surface for user comfort
Shielded release latch prevents snagging and accidental operation
Replaceable 0.30 inch Rubber Butt-Pad offers an anti-slip surface and increases impact protection
Compatible with Magpul ASAP and other receiver-mount sling attachments
Metal strike plate provides a hardened striking point on toe of stock
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
Tubes are accessible from the rear via a tethered, hand-removable rubber plug
Storage compartment in tail of stock with positive latching access door on right hand side
Sling Mounts
Mid – Optional QD Sling Mount accommodates up to 1.5 inch push-button swivels (NOTE: QD Sling Mount Sockets are sold seperately.)
Rear/Bottom – 1.00 inch sling loop

MAGPUL ACS Stock Optional Accessories

Extended Rubber Butt-Pad, 0.55 inch
Enhanced Rubber Butt-Pad, 0.70 inch
Push-button QD Sling Mount Sockets

Weight, Stock: 0.86 lb.
Weight, w⁄
Rec. Extension: 1.16 lb.
Length, Stock: 7.93 in.
LOP Adjustment Range: 3.3 inch.
LOP, M4 Collapsed: 11.45 inch.
LOP, M4 Extended: 14.75 inch.

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

Specifications based on standard-length (flat-back) M4 Carbine Receiver Extension and may vary depending on tube manufacturer.
Standard Rubber Butt-Pad, 0.30 inch weight: 0.09 lb. Optional Extended Rubber Butt-Pad, 0.55 inch (weight: 0.12 lb.) or Enhanced Butt-Pad, 0.70 inch (weight: 0.15 lb.) may be used with either Mil-Spec or Commercial-Spec ACS stocks.


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