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The Magpul ACS (Adaptable Carbine/Storage) is what a lot of folks reach for when they're done fighting a loose, rattly factory stock. It's a drop-in replacement for AR-15 and M4 carbines running mil-spec sized receiver extension tubes, and the moment you get it on you'll notice the difference. That sloped, widened cheek weld sits against your face the same way every time, which is exactly what you want when you're running an LPVO or a red dot and need repeatable eye alignment. There's a supplemental friction lock built into the design that clamps out the play between the stock and the tube, so instead of a wobble, you get a solid, planted feel behind the trigger.
Storage is the ACS's calling card. Two water-resistant tubes run along the sides of the stock, and each one holds up to three CR123 lithium or two AA batteries, accessed from the rear through a tethered rubber plug so you never have to pull the stock off. There's also a central compartment in the tail with a positive-latching door on the right side, run by a chrome-silicon lock spring. It's a natural home for earplugs, a front sight tool, spare optic batteries, or a bore snake. People who run this stock tend to fill that space up fast once they realize it's there.
The stock comes with a 0.30-inch rubber butt-pad that grips your shoulder and keeps things from sliding around, even over armor or a chest rig. The contoured shape is beard-friendly too, so it won't grab whiskers the way some cheek-weld stocks do. Up top you get an anti-snag release latch that stays shielded from accidental bumps, plus an included reversible sling mount kit that fits push-button swivels up to 1.5 inches and a 1-inch rear sling loop. It works with Magpul's ASAP and other receiver-mount sling attachments as well.
It's a touch heavier than a minimalist stock, but that weight buys you the storage and the rock-solid lockup, and most people who buy one call it a fair trade. Made in the USA, in stealth gray. Note that the receiver extension tube is not included.
This is the Mil-Spec version, so it fits any AR-15 or M4 carbine running a mil-spec sized receiver extension (buffer) tube from makers like Colt, BCM, LMT, S&W, and Aero. If your tube is commercial-spec, you'll want the commercial version instead, since the two sizes are slightly different. The buffer tube itself is not included, so you'll reuse the one already on your rifle.
Yes, that's one of the main reasons people buy it. The supplemental friction lock takes up the slop between the stock and the tube, and folks consistently report their rattly factory stock feels rock solid after the swap. Lockup can vary slightly depending on your buffer tube's tolerances, but for most builds it tightens things up noticeably.
The two side tubes are sized for optic batteries, each holding up to three CR123 or two AA batteries, and they're water-resistant with a rear rubber plug. The central compartment in the tail is roomy enough for earplugs, a front sight tool, small parts, or a bore snake. Everything stays on the gun without having to remove the stock to reach it.
It carries a bit more weight than a stripped-down minimalist stock, thanks to the storage compartments and beefier build. Most owners see that added mass as a plus since it helps balance the rifle and it comes with a solid lockup and real storage. If you want the ACS feel with less bulk, the ACS-L drops the battery tubes to shave weight.
| UPC | 873750008950 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAG370GRY |
| Color | Gray |
| Model | |
| Product Type | Mil-Spec |
| Style | Collapsible |
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