The Sig Sauer M400 SDI 5.56mm NATO rifle provides a capable and reliable AR-15 platform engineered for diverse operational requirements. Its design prioritizes consistent function and broad utility, making it suitable for informed enthusiasts demanding a robust and adaptable firearm.
Key Features
Operational Integrity
The M400 SDI integrates a direct impingement operating system, recognized for its proven reliability and efficient cycling characteristics. This architecture ensures consistent gas management and predictable performance across various operational scenarios, from high-round count training to critical defense applications.
Barrel Configuration
A 16-inch barrel optimizes ballistic performance for the 5.56mm NATO cartridge, offering a practical balance between maneuverability and projectile velocity. This configuration supports precision engagement for target acquisition and maintains utility for general-purpose applications, ensuring consistent projectile flight characteristics.
Modularity and Interface
The rifle features a free-float M-LOK handguard, providing a secure and stable interface for the integration of essential firearm accessories such as illumination tools, laser designators, and auxiliary grips. This design mitigates external forces on the barrel, contributing to improved accuracy potential and expanded customization options.
Construction and Finish
The M400 SDI is constructed with robust materials, finished in black to resist environmental wear and maintain a professional aesthetic. Its standard AR-15 architecture ensures extensive compatibility with aftermarket components for operational customization and ease of field maintenance, providing a consistent and functional rifle for responsible ownership.
Technical Specifications
- Caliber: 5.56mm NATO (compatible with .223 Remington)
- Barrel Length: 16 inches
- Capacity: 30 rounds (detachable box magazine)
- Operating System: Direct Impingement
- Handguard: Free-float M-LOK
- Finish: Black
