Magpul Adjustable Storage Stock for AR-15/M16/M4
PY-A-37908
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Description
- Fits AR-15/M16/M4
- Dual battery storage tubes
- Ambidextrous release latch
- Friction lock stability
- Reversible QD sling cup
- Adjustable length of pull
- Stealth Grey Finish
Magpul ACS Carbine Stock Stealth Grey Synthetic for AR-15, M16, M4
Magpul ACS Carbine Stock Stealth Grey Synthetic for AR-15, M16, M4 with Mil-Spec Tube (Tube Not Included) offers expanded storage and a lengthened, widened cheek weld for comfort. Fits Mil-Spec receiver extensions. Dual water-resistant storage tubes hold up to three CR123A or AA batteries each, with tethered plugs to prevent loss; an additional latching storage bay sits near the butt pad. Ambidextrous release latch and supplemental friction lock system provide quick, secure adjustments shielded from accidental activation. Anti-slip rubber butt pad. Reversible QD cup and footman's loop included; compatible with ASAP/ASAP QD mounts. OAL: 8". Weighs 14.10 oz. Made in the U.S.A. Safety note Follow all manufacturer installation instructions. Verify proper fit and secure mounting before use. Comply with local firearm laws and regulations.
Specifications
Overall Rating
10 of 24 Magpul Adjustable Storage Stock for Reviews
This was ABSOLUTELY a game changer for me switching to this stock.
Nice fit very little if any wobble, but with the friction lock it's solid. The storage on board is useful, small "door compartment it good for a spare cr2032 battery, a bolt ring rebuilt kit including an extractor kit. a small tube of PFE grease and a couple of small allen wrenches.
The Magpul ACS Carbine Stock (Mil-Spec) is an excellent upgrade. Fit on a mil-spec buffer tube is tight with zero wobble, and the build quality is exactly what you expect from Magpul, solid and durable. The cheek weld is very comfortable, balance is improved, and the storage compartments are a great bonus. Adjustment is smooth and locks up securely. If you want a sturdy, well-designed stock with great ergonomics and storage, the ACS is a top-notch choice.
Magpul perfection make it my easy go to for what I want and need my guns to be.
I absolutely loved mine I used it in Afghanistan where the typical engagements was about 600-800m and maintaining a cheek to stock perfection was so much easier and comfortable with this and felt extremely comfortable when training or engaging cqc
Very high-quality. Stupid easy to install. My AR has pockets now. Neat. I like the friction slide and lock mechanism. I can only think of one thing to put in all three of the compartments. I wonder how many will fit in there. I will find out.
Love this stock. I usually run the ACS-L but wanted to get this one for the battery storage. Unfortunately the 18350 batteries i have don't fit, but it's not a deal breaker for me.
Easy to install. Love the side by side cigar and beef jerky storage compartments.
Very comfortable stock. Better than the default stock that comes with the kits. Helps with accuracy. Good price too.
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Feb 09, 2026
By Dave
Great stock. Simple to install and provides a perfect cheek rest. Love the storage options as well.