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Magpul ACS Carbine Stock, Mil-Spec Version

Magpul ACS Carbine Stock, Mil-Spec Version
Code: MAG-370-BLK
Quantity in Basket: None
Price: $104.45


Magpul ACS Carbine Stock, Mil-Spec Version

ACS M4 Carbine Collapsible Butt-Stock - Military Model
The patent-pending Magpul ACS (Adaptable Carbine/Storage - Military 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 CTR, the ACS also features a supplemental friction lock system that eliminates 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 rubber butt-pad which gives positive shoulder purchase to prevent slippage even with body armor or modular gear.

Note: There are two basic types of M4 Carbine Receiver Extensions (buffer tubes): Mil-Spec and Commercial. If you have a Commercial extension on your rifle, make sure to order the soon-to-be released Commercial ACS (MAG371). For help identifying which extension is on your rifle, please visit

Made in USA


  • Mounts on Military Carbine Receiver Extension tube (Not included)
  • Shielded release latch prevents snagging and accidental operation
  • Premium chrome-silicon lock spring provides positive locking and long service life
  • Supplemental friction lock eliminates accuracy robbing wobble*
  • Sloping cheek weld provides a wide contact surface for user comfort
  • Replaceable 0.30" Rubber Butt-Pad offers an anti-slip surface and increases impact protection
  • 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 Mounts accommodate up to 1.5" push-button swivels (NOTE: QD Sling Mount Sockets are sold seperately.)
    • Rear / Bottom - 1.00" sling loop