The SIG SAUER M400 TREAD V2 5.56 NATO 16″ 10+1 is a semi-automatic AR-style rifle built for shooters who want a reliable, accurate platform straight from the factory. Chambered in .223 Rem / 5.56 NATO, it pairs a 16″ stainless steel barrel with a free-floating M-LOK handguard and a SIG Matchlite two-stage trigger for consistent performance at the range or in the field.
| Manufacturer | SIG SAUER |
|---|---|
| Model | M400 TREAD V2 |
| Material | Stainless steel barrel, aluminum upper and lower receiver (per manufacturer specs) |
| Compatibility | .223 Rem / 5.56 NATO ammunition, standard AR-15 magazines |
| Finish | Black anodized |
| Weight | 6.85 lbs (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- 16″ Stainless Steel Barrel — WHY IT MATTERS: Stainless steel resists corrosion better than standard chrome-moly, so your rifle stays accurate even in humid or wet conditions. The 1:7 twist rate stabilizes a wide range of bullet weights, from 55-grain plinking loads to 77-grain match ammo.
- Free-Floating M-LOK Handguard — WHY IT MATTERS: A free-float handguard does not touch the barrel, which means no pressure on the barrel harmonics. This design improves accuracy potential and gives you a full-length top Picatinny rail for mounting optics, lights, or lasers.
- SIG Matchlite Two-Stage Trigger — WHY IT MATTERS: Two-stage triggers let you take up the slack in the first stage, then break a clean second stage. This reduces the chance of pulling your shot off target, especially when teaching new shooters or shooting from field positions.
- MAGPUL SL-K Telescoping Stock — WHY IT MATTERS: The SL-K is lightweight and compact, with a positive cheek weld and multiple length-of-pull positions. It fits shooters of different sizes, from youth to adults, without adding extra weight.
- Mid-Length Gas System — WHY IT MATTERS: A mid-length gas system reduces felt recoil and bolt carrier speed compared to a carbine-length system. This means smoother cycling, less wear on parts, and easier follow-up shots.
Who It’s For
The SIG SAUER M400 TREAD V2 is designed for families and beginner shooters who want a ready-to-use AR-15 without the guesswork of building one from parts. It’s also a great choice for youth shooters who need a rifle that fits smaller frames and has a manageable recoil impulse. Experienced shooters will appreciate the upgraded trigger and free-float handguard right out of the box.
Pros and Cons
- Pro: Comes with a two-stage trigger from the factory — no need to upgrade later.
- Pro: Stainless steel barrel for better corrosion resistance and accuracy potential.
- Pro: Free-float M-LOK handguard gives you plenty of rail space for accessories.
- Con: The 10-round magazine capacity (included) may be limiting for some shooters — but it’s compliant in states with capacity restrictions and you can swap it out for standard-capacity mags where legal.
Comparison
| Feature | SIG SAUER M400 TREAD V2 | Geissele Super Duty 16″ | Zev Technologies OZ9 AR |
|---|---|---|---|
| Price | $1,016.67 | ~$1,899 | ~$1,999 |
| Barrel Material | Stainless steel | Chrome-moly, chrome-lined | Stainless steel, fluted |
| Trigger | SIG Matchlite two-stage | Geissele SSA-E two-stage | Zev single-stage |
| Handguard | Free-float M-LOK, 15″ | Geissele MK16 M-LOK, 13.5″ | Zev M-LOK, 15″ |
| Stock | MAGPUL SL-K | Geissele Super 42 | Magpul MOE SL |
| Weight (unloaded) | 6.85 lbs | 7.2 lbs | 6.9 lbs |
The SIG M400 TREAD V2 offers a stainless steel barrel and two-stage trigger at a price point well below the Geissele and Zev options. If you want premium features without the premium price tag, this is a solid choice.
FAQ
Is the SIG SAUER M400 TREAD V2 compatible with standard AR-15 magazines?
Yes. It accepts all standard AR-15/M16 pattern magazines, including Magpul PMAGs, Lancer L5AWM, and metal GI-style magazines. The included 10-round magazine is a standard AR-15 magazine that complies with capacity limits in certain states.
Does the M400 TREAD V2 come with any sights or optics?
No, the rifle ships without iron sights or an optic. The 15-inch free-float handguard has full-length Picatinny top rail, so you can mount your choice of red dot, holographic, or magnified optic. SIG Sauer offers the TREAD line with optional optics packages, but this base model is sold without them.
What is the warranty on the SIG SAUER M400 TREAD V2?
SIG Sauer backs this rifle with their limited lifetime warranty. The warranty covers defects in materials and workmanship for the original owner. It does not cover normal wear and tear or damage from improper use or modifications.
Can I use .223 Remington ammunition in this rifle?
Yes. The barrel is chambered for both .223 Remington and 5.56 NATO. You can safely shoot either cartridge, but for best accuracy, stick with the same type of ammunition once you find a load your rifle likes.
Is the M400 TREAD V2 California compliant?
This specific model (10+1 magazine) may be California compliant with the addition of a magazine lock or other features, depending on your local laws. We recommend checking with your local FFL before ordering if you live in a state with restrictive firearms regulations.
Ready to Buy?
- ✅ Nationwide delivery (all 50 states) — ships to your local FFL
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Browse more options in our AR Rifles category or check out AR Uppers and AR Parts & Accessories.
Last updated: April 2026
FFL Transfer & Firearms Laws for SIG SAUER M400 TREAD V2 5.56 NATO 16″ 10+1
All firearms, including the SIG SAUER M400 TREAD V2 5.56 NATO 16″ 10+1, must be shipped to a licensed Federal Firearms License (FFL) dealer. You will be required to complete a background check and any necessary paperwork before taking possession.
How It Works
- Place your order online.
- Provide your preferred FFL dealer information.
- We ship the firearm directly to your FFL.
- You complete the background check and pickup at the FFL.
Legal Compliance
We comply with all federal and state firearm laws. It is your responsibility to ensure the SIG SAUER M400 TREAD V2 5.56 NATO 16″ 10+1 is legal in your state. Some states may have restrictions on certain firearm models or features.
Helpful Resources
Need assistance? Contact our Miami store for help with FFL transfers and firearm compliance.
Frequently Asked Questions About This Product
Why buy SIG SAUER M400 TREAD V2 5.56 NATO 16″ 10+1 from Miami Shooters Supply?
We’re a trusted firearms dealer offering fast shipping, competitive pricing, and 100% compliance with U.S. federal firearm laws. All orders ship from our licensed facility with full tracking and expert customer service.
Where can I buy SIG SAUER M400 TREAD V2 5.56 NATO 16″ 10+1?
You can purchase this item directly on our website and have it shipped to your local FFL dealer. You can also visit us in-store in Miami, Florida.
Is SIG SAUER M400 TREAD V2 5.56 NATO 16″ 10+1 available now?
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What category does this product belong to?
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Is this product legal in my state?
It is your responsibility to ensure this item is legal in your state or locality. We ship only to valid FFL dealers in compliance with U.S. laws. Always check your local regulations.
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FFL Transfer & Firearms Laws
All firearms, including the SIG SAUER M400 TREAD V2 5.56 NATO 16″ 10+1, must be shipped to a licensed Federal Firearms License (FFL) dealer. A background check and any required local paperwork must be completed before you can take possession.
How It Works
- Place your order online.
- Send us your preferred local FFL dealer info.
- We ship the firearm to your FFL after verification.
- Complete background check and pick up from your dealer.
Legal Compliance
We comply with all U.S. firearm laws. It is your responsibility to ensure the SIG SAUER M400 TREAD V2 5.56 NATO 16″ 10+1 is legal in your state. Some states (e.g. CA, NY, NJ) have restrictions on magazine size or certain features.
Helpful Links
Need help? Contact our team — we’ll guide you through selecting a compliant firearm and the FFL transfer process.
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