Description
The M400-SDI X PISTOL is a premium AR-platform firearm from Sig Sauer, engineered for superior handling and performance. This model features a durable 7075-T6 aluminum upper and lower receiver with a hard-coat anodized finish for maximum corrosion resistance. It is built around a 11.5-inch cold hammer-forged barrel and a minimalist pistol brace, offering exceptional reliability and maneuverability for close-quarters use and tactical applications.
Key Features
- 11.5-inch cold hammer-forged barrel with 1:7 twist rate
- Sig Sauer minimalist 6-position pistol brace for compact stability
- M-LOK compatible free-float handguard for accessory mounting
- Enhanced mil-spec trigger group for a crisp, consistent pull
- Includes Sig Sauer’s proprietary ambidextrous safety selector
Specifications
| Caliber / Type | 5.56 NATO / AR-15 Pistol |
|---|---|
| Material | 7075-T6 Aluminum Receiver |
| Finish | Hard-Coat Anodized |
| Compatibility | Standard AR-15 parts and magazines |
| Weight | 6.2 lbs (unloaded) |
The M400-SDI X utilizes a direct impingement gas system paired with a carbine-length gas tube, a proven setup that reduces felt recoil and enhances cycling reliability with 5.56mm and .223 Remington ammunition. The cold hammer-forged barrel provides extended service life and consistent accuracy. This configuration is a trusted choice for defensive use, training, and as a highly adaptable platform for user customization.
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