MagPul Industries

Magpul Industries ACS Stock Fits AR-15 Mil-Spec Black MAG370-BLK

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  • Regular price $85.45
  • 6 In Stock
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The Magpul ACS (Adaptable Carbine/Storage) - Mil-Spec model is a drop-in replacement buttstock for AR15/M4 carbines using Mil-Spec sized receiver extension tubes. Dual, rear accessible, water-resistant battery storage tubes and an integral storage compartment in the butt of the stock provides multiple storage options.

Similar to the Magpul CTR®, the ACS also features an anti-snag release latch to prevent accidental activation along with a supplemental friction lock system that minimizes excessive stock movement for enhanced weapon stability and accuracy*. 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.

Made in the USA.


AR10, AR15, M4, M16, M110, SR25


Mil-Spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, LMT, S&W, 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.


14.1 oz.

Weight, w/ receiver extension

18.1 oz.

Width, max

2.5 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.

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.

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