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Magpul ACS M4 Carbine Collapsible Butt-Stock (Mil-Spec)

$86.99 List price:

Government Export Restriction

This item may be regulated for export by the U.S. Department of State or the U.S. Department of Commerce. Please see our Export Policy prior to placing your order.


The Magpul ACS M4 Carbine Collapsible Butt-Stock (Mil-Spec) 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. The ACS comes standard with a rubber butt-pad which gives positive shoulder purchase to prevent slippage even with body armor or modular gear.

  • Reinforced, heat-resistant Polymer construction
  • 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
  • Rear/Bottom 1.00" sling loop
  • LENGTH: 7.93"
  • LOP, M4 COLLAPSED: 11.45"
  • LOP, M4 EXTENDED: 14.75"
  • WEIGHT, STOCK: 0.86 lb.
  • Made in the USA

COLORS: Black, Flat Dark Earth, OD, Foliage or Grey

*Friction lock performance may vary depending on the receiver extension's dimensional tolerances

This item or some of its components cannot be exported from the United States of America without a valid export permit from the U.S. State Dept. due to ITAR restrictions.


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