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  1. Great cheek weld for a carbine stock
    If you're like me and hate the crappy cheek weld you get with AR carbine stocks, but don't want a fixed stock like a PRS, this is a great option. The big sloped cheek weld is a hundred times better than a standard stock. The friction lock works very well to eliminate the slop and rattle you're used to with a standard stock as well. This is a pretty big stock though, the storage options are nice. Room for batteries for your optics, and I keep a bore snake in the storage compartment for quick cleaning in the field. Combined with the oil bottle in my MIAD grip, makes for a nice self contained rifle with everything you need to keep your rifle running.

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Magpul MAG370 ACS Carbine Stock (Mil-Spec)

In stock
From CA$145.09

The Magpul ACS (Adaptable Carbine/Storage) is a drop-in replacement buttstock for AR-15/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.


  • Mounts on mil-spec sized carbine buffer tube (not included)
  • Sloping cheek weld provides a wide contact surface for user comfort
  • Two water-resistant battery storage tubes located on the left and right sides of the stock; each will store up to three CR123 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
  • Supplemental friction lock minimizes accuracy-robbing wobble*
  • Shielded release latch prevents snagging and accidental operation
  • Premium chrome-silicon lock spring provides positive locking and long service life
  • Replaceable 0.30" Rubber Butt-Pad offers an anti-slip surface and increases impact protection
  • Compatible with Magpul ASAP, ASAP QD, and other receiver-mount sling attachments
  • Made in U.S.A.

Sling Mounts

  • Mid – Included reversible Sling Mount Kit – TYPE 3 fits up to 1.5" push-button swivels (swivel not included)
  • Rear/Bottom - 1" sling loop


  • ACS Carbine Stock, Mil-Spec
  • Weight: 14.1 oz.
  • Length, max: 8.0 in.
  • Width, max: 2.5 in.
  • LOP Adjustment Range: 3.3 in.
  • LOP, M4 Collapsed: ~11.6 in.
  • LOP, M4 Extended: ~14.9 in.

Fine Print

  • * 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."

    You get:

    • (1) Buttstock

      Compatible with:

      • Mil-spec buffer tubes

      Installation Difficulty: 

      Tools required: none

      Installation notes: none

      Model numbers:

      • MAG370-BLK - Black
      • MAGG370-ODG - Olive Drab Green
      • MAG370-GRY - Stealth Grey
      • MAGG370-FDE - Flat Dark Earth