Description
The M400-SDI X Direct is a premium, direct-impingement upper receiver assembly from SIG SAUER, designed for the dedicated shooter. It features a 16-inch, cold hammer-forged barrel with a 1:7 twist rate, finished with a durable Nitride coating for enhanced corrosion resistance. This complete upper is engineered for direct compatibility with standard AR-15/M4 pattern lower receivers, offering a robust and reliable foundation for your rifle build.
Key Features
- 16-inch cold hammer-forged barrel with a 1:7 twist rate for 5.56 NATO/.223 Rem.
- Durable Nitride finish on the barrel for superior wear and corrosion resistance.
- M-LOK compatible free-float handguard for secure accessory mounting.
- Includes a mid-length gas system for reliable cycling and reduced felt recoil.
- Features a MIL-SPEC forward assist and dust cover for enhanced reliability.
Specifications
| Caliber / Type | 5.56 NATO / .223 Remington |
|---|---|
| Material | 7075-T6 Aluminum / Steel Barrel |
| Finish | Hard Coat Anodized / Nitride Barrel |
| Compatibility | Standard AR-15/M4 Pattern Lower Receivers |
| Weight | Approx. 4.2 lbs (Upper Only) |
The M400-SDI X Direct’s cold hammer-forged barrel provides exceptional bore consistency and longevity, critical for sustained accuracy. The mid-length gas system is optimized for the 16-inch barrel, ensuring reliable extraction with a wide range of 5.56mm ammunition. This configuration is a proven choice for duty, training, and defensive applications where consistent performance is non-negotiable.
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