MAG-370: Magpul Ind. ACS Collapsible Stock - AR15-M4 Mil-Spec Dia.
The patent-pending Magpul ACS (Adaptable Carbine/Storage) – Mil-Spec Model is a drop-in replacement butt-stock for carbines using mil-spec 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 CTR™, the ACS 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 ACS comes standard with a 0.30" 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 and 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. This is the MIL SPEC version.

Magpul Ind. ACS Features:
o Mounts on military-spec carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others
o Supplemental friction lock minimizes accuracy robbing wobble*
o Premium chrome-silicon lock spring provides positive locking and long service life
o Sloping cheek weld provides a wide contact surface for user comfort
o Shielded release latch prevents snagging and accidental operation
o Replaceable 0.30" Rubber Butt-Pad offers an anti-slip surface and increases impact protection
o Compatible with Magpul ASAP® and other receiver-mount sling attachments
o Metal strike plate provides a hardened striking point on toe of stock
o Two water-resistant battery storage tubes located on the left and right sides of the stock
o Each tube will store up to three CR123 lithium or two AA batteries
o Tubes are accessible from the rear via a tethered, hand-removable rubber plug
o Storage compartment in tail of stock with positive latching access door on right hand side
o Made in U.S.A.

Magpul Ind. ACS Specifications:
o ACS, Mil-Spec Carbine Stock (w/ Rubber Butt-Pad, 0.30")
o Weight, Stock: 0.86 lb.
o Weight, w/ Rec. Extension: 1.16 lb.
o Length, Stock: 7.93 in.
o LOP Adjustment Range: 3.3 in.
o LOP, M4 Collapsed: 11.45 in.
o LOP, M4 Extended: 14.75 in.
o Standard Rubber Butt-Pad, 0.30" weight: 0.09 lb.


* 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.