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 U.S.A.

FEATURES

• Mounts on mil-spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others (please see the note below)
• 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 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
• 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
• Sling Mounts
  • Mid – Included reversible Sling Mount Kit – TYPE 3 fits up to 1.5" push-button swivels (swivel not included)
  • Rear/Bottom - 1.00" sling loop

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 .