Description
The SIG Sauer M400-TREAD Pistol is a purpose-built, high-performance AR pistol for shooters who demand reliability and modularity in a compact package. Since we started stocking it in spring 2025, it has consistently been one of our top-selling firearms in its category. It’s designed for home defense, vehicle use, or as a highly adaptable platform for customization.
Why This One?
- SIG TREAD Series DNA: Built on the proven M400 platform with enhanced, duty-ready components straight from the factory, including the TREAD handguard and enhanced controls.
- Optimal Pistol Configuration: The 10.5″ barrel and pistol brace setup provides excellent maneuverability and control without the paperwork of an SBR, making it ideal for tight spaces.
- Fully Ambidextrous: Features an ambidextrous safety selector and magazine release, accommodating both right and left-handed shooters seamlessly.
- Ready for Optics & Accessories: The free-float M-LOK handguard and flattop upper receiver with a full-length Picatinny rail offer immediate mounting solutions for optics, lights, and grips.
- Proven Reliability: Utilizes SIG’s cold hammer-forged barrel and a robust nitride finish for durability and consistent performance round after round.
Full Spec Sheet
| Model | M400-TREAD Pistol |
| Caliber | 5.56 NATO / .223 Rem |
| Barrel Length | 10.5 inches |
| Overall Length | 26.5 inches |
| Weight (measured) | 5.7 lbs |
| Handguard | 15″ SIG TREAD M-LOK |
| Trigger | SIG Enhanced Mil-Spec |
| Brace | SIG SB-MINI Pistol Stabilizing Brace |
Q & A
Is the pistol brace adjustable?
Yes. The included SIG SB-MINI brace features an adjustable strap and is designed to be used with the pistol buffer tube, allowing for a secure and customizable fit.
Does it come with iron sights?
No, the M400-TREAD Pistol does not include iron sights from the factory. It is shipped with flip-up front and rear Magpul MBUS sights installed, providing a reliable backup sighting system.
What is the thread pattern on the barrel?
The 10.5″ barrel is threaded 1/2×28, which is the standard for 5.56/.223 caliber firearms, allowing for direct attachment of common muzzle devices like flash hiders or compensators.
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