Magpul ACS Carbine Stock, Black (Mil-Spec)- Mag370

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Magpul ACS Carbine Stock (Mil-Spec)- Mag370

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$ 85.45
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$ 85.45

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Quick Overview

SKU: 465C
  • Weight: 14.1 oz.
  • Weight, w/receiver extension: 18.1 oz.
  • Length, max: 8.0 in.
  • Width, max: 2.2 in.
  • LOP Adjustment Range: 3.3 in.
  • LOP, M4 Collapsed: ~11.8 in.
  • LOP, M4 Extended: ~15.1 in.
  • * Friction lock performance may vary depending on the host receiver extension's dimensional tolerances.
  • ** Specifications based on standard-length (flat-back) M4 Carbine receiver extension and may vary depending on tube manufacturer.

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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.



  • Mounts on mil-spec sized carbine receiver extension tube (not included)
  • 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 stockStorage compartment in tail of stock with positive latching access door on right hand side
    • 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
  • 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 Commerical-Spec ACS.

SKU: 465C
SKU 465C
Department AR Parts
Brand Magpul
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Unit Price N/A
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SKU: 465C

Questions and Answers

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is this the same acs model as the acs 1xl50?
John K on Jan 18, 2019


4.8 / 5.0
8 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Love this stock. Lots of storage and comfortable without much added weight.
July 19, 2019
1 month ago
Liked it so much I bought another
Install is simple,. Adjust to preferred length, lock in place, and this baby holds rock solid. Cheek weld is decent. Storage compartments for spare double or triple A batteries, and another one for the CR type batteries, or maybe some rifle cleaning stuff or something. I don’t judge.
June 23, 2019
2 months ago
Hands down the best addition to any of my ARs!
Absolutely amazing locking stock. Without a doubt my go to stock.
M&P 15 beefed up
M&P 15 beefed up
February 10, 2019
6 months ago
Good stock but needs improvements.
This is a good quality stock with some nice features, but it has a couple of annoying problems. It's a pain to get on and off of the buffer tube because of the way you have to pry the little plunger up to get past the locking holes. And, the hole for the QD sling mount is too close to the battery storage compartment which causes the sling to bind against it and not swivel.

Other than that, I like it.
January 19, 2019
1 year ago
Magpul quality and psa performance.
January 17, 2019
7 months ago
Love it! lots would recommend it.
January 3, 2019
9 months ago
I have two of these and I love them they are the most comfortable ones I have
User submitted image
Added Nov 28, 2018
November 28, 2018
10 months ago
Nice Stock
Appears to be a nice quality item but have not had time to finish this build to range level.
June 9, 2018
1 year ago

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