Description
The SIG SAUER M400 TREAD California is a feature-complete AR-15 platform engineered for compliance with California regulations. This rifle features a 16-inch cold hammer-forged barrel with a 1:8 twist rate and a mid-length gas system for reliable cycling. Its standout TREAD handguard offers a full-length M-LOK interface for accessory mounting, while the included ambidextrous safety and Magpul furniture enhance its out-of-the-box utility for sport shooting and home defense.
Key Features
- California-compliant featureless stock and grip configuration
- 16″ cold hammer-forged 4150 steel barrel with 1:8″ twist
- Full-length TREAD M-LOK handguard for maximum accessory mounting
- Includes Magpul MOE stock and MIAD pistol grip system
- Mid-length gas system and ambidextrous safety selector
Specifications
| Caliber / Type | 5.56 NATO / .223 Remington Semi-Automatic Rifle |
|---|---|
| Material | 7075-T6 Aluminum Upper/Lower, 4150 Steel Barrel |
| Finish | Hardcoat Anodized, Nitride Barrel Finish |
| Compatibility | Standard AR-15/M4 components and magazines |
| Weight | 6.7 lbs |
The M400 TREAD’s mid-length gas system reduces felt recoil and bolt carrier group stress, enhancing longevity. The 1:8 twist rate barrel optimally stabilizes a wide range of 5.56/.223 bullet weights from 55 to 77 grains. This configuration, paired with SIG’s proven direct impingement operation, delivers consistent accuracy and reliability for high-round-count training sessions and competitive use.




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