Description
SIG SAUER M400 SDI 5.56 NATO Rifle
The SIG SAUER M400 SDI is a performance-focused evolution of SIG SAUER’s established M400 rifle platform. Chambered in 5.56 NATO, the SDI combines familiar AR-style operation with upgraded components and modern ergonomics in a versatile factory configuration.
This black M400 SDI features a 16-inch barrel, direct-impingement operating system, free-float M-LOK handguard, ambidextrous controls and 30+1 capacity, providing a capable foundation for range shooting, training and sporting applications.
16-Inch 5.56 NATO Barrel
The SIG SAUER M400 SDI features a 16-inch barrel chambered in 5.56 NATO, providing a practical balance between overall handling and ballistic performance.
The 16-inch configuration maintains manageable dimensions while providing the barrel length expected from a versatile general-purpose AR-style rifle.
Direct-Impingement Operating System
The M400 SDI uses a direct-impingement gas operating system, maintaining the familiar operating characteristics of the traditional AR platform.
This proven system provides straightforward function and maintenance while giving shooters an operating platform that is widely recognized throughout the modern sporting rifle market.
Free-Float M-LOK Handguard
A modern free-float M-LOK handguard surrounds the barrel and provides multiple mounting positions for compatible accessories.
The free-float design minimizes direct contact between the handguard and barrel while the M-LOK interface provides a streamlined and highly adaptable accessory mounting system.
Ambidextrous Controls
The SIG SAUER M400 SDI incorporates ambidextrous controls designed to make key rifle functions conveniently accessible from either side of the firearm.
This upgraded control layout increases versatility for both right- and left-handed shooters and helps distinguish the SDI configuration within the broader M400 family.
Modern AR-Style Ergonomics
The M400 SDI maintains the familiar ergonomics and operating layout associated with the AR platform while incorporating SIG SAUER’s own component and design choices.
The combination provides shooters with a recognizable interface while retaining the distinctive features and factory configuration of the M400 SDI.
Adjustable Stock
An adjustable stock allows the rifle’s length of pull to be configured around different shooters, shooting positions and equipment.
The adjustable design contributes to the overall versatility of the M400 SDI and makes the rifle adaptable to a broad range of users.
30+1 Round Capacity
The SIG SAUER M400 SDI includes a 30-round detachable magazine, providing a potential capacity of 30+1 rounds when loaded with a round in the chamber.
The M400 platform uses commonly available compatible AR-pattern magazines, providing broad magazine availability and additional configuration options.
Black Factory Finish
This M400 SDI features a black factory finish for a clean, traditional appearance consistent with modern AR-style rifles.
The black finish complements the rifle’s streamlined handguard, adjustable stock and modern control layout.
Performance-Focused SIG SAUER M400
The SIG SAUER M400 SDI combines the familiar operation of an AR-style rifle with modern factory upgrades designed to improve versatility and usability.
For shooters searching for a SIG SAUER 5.56 NATO rifle with a 16-inch barrel, free-float M-LOK handguard and ambidextrous controls, the M400 SDI provides a well-equipped configuration within the established M400 family.
SIG SAUER M400 SDI Features
- Manufacturer: SIG SAUER
- Model: M400 SDI
- Caliber: 5.56 NATO
- Action: Semi-automatic
- Operating System: Direct impingement
- Barrel Length: 16 inches
- Handguard: Free-float M-LOK
- Controls: Ambidextrous
- Stock: Adjustable
- Capacity: 30+1 rounds
- Color: Black
- Platform: AR-style rifle
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