MAGPUL ACS Carbine Stock – Commercial Tube MAG371 AR15 AR10

MAGPUL ACS Carbine Stock – Commercial Tube MAG371 AR15 AR10

Model:  MAG371


Manufacturer:  Magpul Industries

Availability : In-Stock

Available Options:
Add Enhanced Buttpad MAG317:
Kit Options: STOCK ONLY  
6 Position Kit ( + $39.00 )
6 Position Kit and Carbine Stock Tool ( + $45.00 )
308 Complete Tube, Buffer, Spring Kit ( + $51.95 )


Add to Wishlist

MAGPUL ACS Carbine Stock – Commercial Tube MAG371 AR15



The patent-pending Magpul ACS (Adaptable Carbine/Storage) – Commercial-Spec Model is a drop-in replacement butt-stock for carbines using NON mil-spec receiver extension tubes (AKA "Commercial"). 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 Magpul CTR™, the ACS also features a supplemental friction lock system that minimizes 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 0.30" thick rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear.

NOTE: There are two basic sizes of M4 Carbine receiver extensions (buffer tubes): mil-spec (1.14" diameter) and commercial-spec (1.17" diameter). If you have a mil-spec extension on your rifle, make sure to order the MILSPEC MAG370. Please see the "Related Info" section above to help determine which tube you have.

Made in U.S.A.


  • Mounts on Commercial Carbine Receiver Extension tube (not included) from manufacturers such as Bushmaster, DPMS, RRA, Olympic, and others
  • Supplemental friction lock minimizes accuracy robbing wobble*
  • Premium chrome-silicon lock spring provides positive locking and long service life
  • Sloping cheek weld provides a wide contact surface for user comfort
  • Shielded release latch prevents snagging and accidental operation
  • Replaceable 0.30" Rubber Butt-Pad offers an anti-slip surface and increases impact protection
  • Compatible with Magpul ASAP® and other receiver-mount sling attachments
  • 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 Mount accommodates up to 1.5" push-button swivels (NOTE: QD Sling Mount Sockets are sold seperately.)
    • Rear/Bottom - 1.00" sling loop

Optional Accessories**

  • Extended Rubber Butt-Pad, 0.55"
  • Enhanced Rubber Butt-Pad, 0.70"
  • Push-button QD Sling Mount Sockets


  • ACS, Commercial-Spec Carbine Stock (w/ Rubber Butt-Pad, 0.30")
    • Weight, Stock: 0.86 lb.
    • Weight, w/ Rec. Extension: 1.16 lb.
    • Length, Stock: 7.93 in.
    • LOP Adjustment Range: 3.3 in.
    • LOP, M4 Collapsed: 11.45 in.
    • LOP, M4 Extended: 14.75 in.

ACS™ Carbine Stock Technical Resources:

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

Write a review

There's no reviews for this product, be the first to write a review.

McAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams
Valhalla Tactical gives you peace of mind that your order will be what you want, when you need it