Description
The Magpul MOE Carbine Stock in commercial-spec is one of those upgrades that just makes sense on almost any AR-15 or M4 build. It drops right onto commercial-diameter receiver extension tubes and gives you a clean, streamlined A-frame that won't hang up on your gear when you're shouldering the rifle. Magpul built this as part of their Original Equipment line, which means you get their engineering and material quality in a stripped-down, budget-friendly package that skips the extras you may not need.
What Sets the MOE Commercial Stock Apart from Mil-Spec
Here's the part people trip up on: there are two buffer tube sizes out there, mil-spec and commercial. This is the commercial version (MAG401), so it's sized for the slightly larger, slant-back tubes you'll find on rifles from makers like Bushmaster, DPMS, and Olympic. If your tube measures larger and has that angled back edge, this is the one you want. Got a mil-spec tube instead? You'll need the MAG400. A quick tip: if a stock slides on loose, it's usually a commercial stock on a mil-spec tube, and vice versa.
Built-In Details on the MOE Carbine Stock
The commercial model ships with a thick 0.55-inch extended rubber butt-pad that gives you solid shoulder purchase and helps soak up recoil, which is a nice touch if you're running heavier calibers. A premium chrome-silicon lock spring keeps the stock positively locked and holds up over the long haul, and the release latch sits shielded so you're not accidentally collapsing the stock mid-string. It also plays nice with Magpul ASAP and ASAP-QD sling mounts, plus the side slots accept optional cheek risers for non-AR platforms.
Fit and Feel of the Magpul MOE Stock
With six positions across roughly 10.7 to 14.5 inches of length of pull, you can dial in a comfortable fit whether you're running plates or shooting in a t-shirt. It weighs in around half a pound of reinforced polymer, so it keeps the rifle light and quick to handle. Made in the USA, it's a proven workhorse that's earned its spot on countless builds. Keep in mind the receiver extension tube is not included.
Key Specifications
- Manufacturer: Magpul Industries
- Manufacturer Part Number: MAG401-BLK
- UPC: 873750003146
- Model: AR-15 / M4 / M16
- Product Type: Commercial-Spec
- Style: Collapsible
- Color: Black
- Material: Reinforced Polymer
- Weight: 0.53 lb (approx. 8.5 oz)
- Maximum Length: 7.15 in
- LOP Adjustment Range: 3.80 in
- LOP, M4 Collapsed: 10.95 in
- LOP, M4 Extended: 14.75 in
- Butt-Pad: 0.55 in Extended Rubber
- Sling Compatibility: Magpul ASAP, ASAP-QD, receiver-mount attachments
- Made In: USA
What’s Included
- Magpul MOE Carbine Stock (Commercial-Spec)
- 0.55" Extended Rubber Butt-Pad (installed)
Frequently Asked Questions
How do I know if I need the commercial or mil-spec MOE Carbine Stock?
It comes down to your buffer tube. Commercial tubes are slightly larger in diameter and usually have a slanted back edge, while mil-spec tubes are a touch smaller with a straight back. This MAG401 is the commercial version, so if your tube is larger with that angled back, you're in the right place. If you've got a mil-spec tube, grab the MAG400 instead.
Does the MOE Carbine Stock come with a buffer tube?
No, the receiver extension tube is not included. This is a drop-in replacement stock designed to slide onto a commercial-spec tube you already have on your rifle. If you're building from scratch, you'll need to pick up a commercial-diameter carbine buffer tube separately.
Can I add a sling to the Magpul MOE Carbine Stock?
Yes. It's compatible with Magpul ASAP and ASAP-QD receiver-mount sling attachments, and it also has 1.25-inch sling loops at the rear and bottom. There's a lanyard hole at the toe if you want to rig up paracord as well.
Is the MOE Commercial Stock comfortable with heavier recoiling calibers?
The commercial model uses a thicker 0.55-inch extended rubber butt-pad, which gives you better shoulder purchase and helps take the edge off recoil compared to the thinner mil-spec pad. It's a solid choice if you're running something like 450 Bushmaster or 458 SOCOM. The rubber surface also grips well against body armor and gear so it stays put when you shoulder up.





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