Magpul ACS Carbine Stock - Mil-Spec - Black

Manufactured by Magpul Industries
Manufactured by Magpul Industries
29 Reviews

In Stock

Standard orders will ship out in 1 business day (M-F) if ordered by 3:30 pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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The Adaptable Carbine Stock is a drop-in replacement buttstock for AR-15/M4 carbines with MIL-SPEC receiver extensions. Dual, rear accessible, water-resistant battery storage tubes store up to three CR123A lithium or two AA batteries. An integral storage compartment in the butt of the stock offers additional storage. Features an anti-snag release latch to prevent accidental activation along with a friction lock system that minimizes excessive stock movement for enhanced weapon stability and accuracy.

NOTE: Friction lock performance may vary depending on the host receiver extension dimensional tolerances.

  • MIL-SPEC carbine receiver extension compatible
  • Sloping cheek weld
  • Storage compartment
  • Battery storage tubes
  • Friction lock
  • Shielded release latch
  • Premium chrome silicon lock spring
  • Replaceable 0.30" rubber buttpad
  • Included reversible sling mount kit
  • Rear/bottom 1" sling loop
  • Length: 8”
  • Width: 2.5”
  • Length of pull adjustment range: 3.3”
  • Collapsed length of pull: ~11.6”
  • Extended length of pull: ~14.9”
  • Weight: 14.1 oz

Magpul continues to grow and develop based on innovation, simplicity, and efficiency. At Magpul, mission driven requirements inform their product design, materials, and manufacturing, focusing on efficiency without sacrificing quality or performance.
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ManufacturerMagpul Industries
Sling MountMultiple - See Description
StorageInternal Storage
Weight14.08 Oz
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

29 reviews


Great stock


I have been wanting to get one of this stock until I saw that it is on sale. Now I got it. This is an awesome stock. I have been wondering how the cheek weld will perform. I must say that the cheek weld held my sighting real steady with movement while shooting a string of firing sequences. This stock gives me an ample storage for battery for my optics and storage for cleaning stuff or spare parts. This stock is rock solid when it gets locked in place. Another great product from Magpul. Also an awesome/pleasant shopping experience from Primary Arms. Fast shipping too. You guys rock!

Great stock


I really like this stock. Great cheekweld and locks up nice. I would say the only downfall is it's a bit heavy. But I'm thinking of swapping my a few other guns with this one.



It's magpul. Does what it's supposed to do. Kind of a bugger to get on the buffer tube. they give you plastic bullets that bend and break to help install the stock when really you need a titanium crowbar.



Magpul ACS Stock Mil-specExcellent!

Magpul ACS Stock


Magpul quality. Fit is excellent! Packaged excellent! Super fast shipping !

Good Equipment


Thanks for the prompt delivery of the Magpul ACS Stock. It fits great on my service rifle. Excited to order from you again.

Excellence from Primary Arms


The ACS is a good stock. Chunky, and it has a little bit of wiggle to it, but it has a nice feel, it's very simple to install, and it has storage for little things that you might need at some point. A small cleaning kit or some tools, storage for batteries, which is nice for my Eotech (which I also got from PA). They did a great job getting it to me quickly, even during the holiday rush. I really appreciate the time they take for their great customer service!

Excellent Stock


This is a great stock and fits very snugly on the mil-spec buffer tube - no slop at all. Friction lock eliminates any movement. Great fit and adjustability. My only complaint is that the battery storage tubes do not have a tension spring to prevent the batteries from shifting and making noise when they hit each other, would've expected that detail to be covered on a stock of this price.

good cheek weld


This stock provides one of the best cheek welds of the collapsible stocks I've tried. Also, it's long enough (for me) that my facial hair doesn't get trapped in between the buffer tube and the front of the stock during use.

ACS Stock


This was a nice addition to my Daniel Defense, I like the storage capabilities.