The Sig Sauer M400 TREAD V2 5.56 NATO 16in Concrete 30rd is a direct evolution of the M400 platform, engineered for dependable, configurable performance across range work, competition, and practical field applications. This rifle ships with a 16-inch stainless steel barrel, a mid-length gas system for smoother cycling, and a free-floating enhanced M-LOK handguard for secure accessory mounting. It includes an ambidextrous safety and magazine release, an integrated lower-receiver QD mount, and a six-position Magpul SL-K telescoping stock for user adjustment. The Concrete Cerakote finish provides corrosion resistance and a low-visibility profile that holds up under hard use.
| Manufacturer | Sig Sauer |
|---|---|
| Model | M400 TREAD V2 |
| Material | Stainless steel barrel, aluminum receiver |
| Compatibility | 5.56 NATO / .223 Remington |
| Finish | Concrete Cerakote |
| Weight | 6.85 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- Mid-Length Gas System: Reduces recoil impulse and improves reliability over carbine-length systems, especially with suppressed fire.
- Free-Floating Enhanced M-LOK Handguard: Provides a rigid mounting surface for lights, lasers, and grips without affecting barrel harmonics.
- Ambidextrous Safety and Magazine Release: Allows immediate manipulation from either shoulder, critical for CQB and weak-side drills.
- Magpul SL-K Stock: Locks up tight with no wobble and offers six positions for LOP adjustment across body armor or light kit.
- Integrated Lower-Receiver QD Mount: Accepts standard QD sling swivels without aftermarket adapters, saving rail space.
Who It’s For
This rifle is built for law enforcement patrol rifles, competitive shooters in 3-Gun or tactical matches, and serious shooters who need a reliable platform that accepts aftermarket upgrades without proprietary parts. The mid-length gas system and free-float handgun make it suitable for courses of fire requiring sustained accuracy and fast target transitions.
Pros and Cons
- Pro: Stainless steel barrel offers better heat dissipation and corrosion resistance than chrome-moly, with consistent accuracy over long strings of fire.
- Pro: Ambidextrous controls are standard, not an upcharge—cuts training time for left-handed shooters.
- Con: Trigger is mil-spec, not match-grade. Most serious shooters will upgrade to a Geissele or Timney trigger for precision work.
Comparison
| Feature | Sig Sauer M400 TREAD V2 | Geissele Super Duty 16 | Zev Technologies OZ9 Rifle |
|---|---|---|---|
| Barrel Material | Stainless steel | Chrome-moly, chrome-lined | Stainless steel, nitride |
| Gas System | Mid-length | Mid-length | Mid-length |
| Handguard | Free-float M-LOK | Geissele MK16 M-LOK | Zev Pro M-LOK |
| Trigger | Mil-spec single-stage | Geissele SSA-E two-stage | Zev adjustable single-stage |
| Price (approx) | $1,119 | $1,850 | $2,100 |
FAQ
What magazines are compatible with the Sig Sauer M400 TREAD V2?
This rifle accepts all standard AR-15/M16 pattern magazines. It ships with one 30-round Magpul PMAG Gen M3. Use any high-quality magazine from Magpul, Lancer, or SureFeed for reliable feeding.
Does this rifle come with iron sights?
No, the M400 TREAD V2 ships without sights or optics. The flat-top upper receiver is drilled and tapped for optics mounting, and the free-float handguard allows co-witnessed backup iron sights if you choose to add them.
Is the barrel threaded for a suppressor?
Yes, the 16-inch barrel features a 1/2×28 threaded muzzle, standard for 5.56 NATO. A thread protector is included. Use a direct-thread or QD suppressor with compatible mounts.
Can I swap the handguard for another M-LOK model?
Yes, the barrel nut is a standard mil-spec pattern, so any AR-15 free-float handguard with a compatible barrel nut will work. However, the factory handguard is lightweight and well-balanced, so most users keep it.
Trust Block
- ✓ Nationwide delivery (all 50 states)
- ✓ Ships 1-2 business days
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Related categories: Semi Auto Rifles, AR-15 Rifles, Sig Sauer Rifles
Last updated: April 2026
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