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PTS ACS™ M4 Carbine Collapsible Butt-Stock

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.


  • Professional Training System Version

  • 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
         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

  •  Storage compartment in tail of stock with positive latching access door on right hand side

  • Sling Mounts
         o Mid - Optional QD sling mounts accommodate up to 1.5” push-button swivels
         o Rear / Bottom - 1.00” sling loop



Add to Cart:

  • Part #: PT024450340

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