Description
SIG SAUER M400 Sentry 5.56 NATO Rifle
The SIG SAUER M400 Sentry combines the proven M400 AR-platform design with a factory-installed collection of SIG SAUER accessories. Chambered in 5.56 NATO, this rifle provides a complete factory configuration built around versatility, reliability and practical performance.
This M400 Sentry features a 16-inch barrel, ROMEO5 Gen II red dot optic, FOXTROT-MSR weapon light, M-LOK handguard, vertical foregrip and 30+1 capacity, giving shooters a well-equipped platform without requiring an immediate collection of aftermarket upgrades.
Factory-Installed ROMEO5 Gen II Red Dot
The SIG SAUER M400 Sentry comes equipped with a ROMEO5 Gen II red dot sight, providing a compact electronic aiming solution directly from the factory.
Including the ROMEO5 adds significant value to the package and gives shooters an immediately usable optic designed to complement the M400 platform.
16-Inch 5.56 NATO Barrel
The M400 Sentry features a 16-inch barrel chambered in 5.56 NATO, providing a versatile configuration for recreational shooting, training and sporting applications.
The 16-inch barrel maintains manageable overall dimensions while providing the ballistic performance expected from a full-length modern sporting rifle.
Direct-Impingement M400 Platform
The SIG SAUER M400 Sentry uses a direct-impingement gas operating system with a rotating bolt, maintaining the familiar operating characteristics of the AR-15 platform.
This proven architecture provides straightforward operation and broad familiarity for shooters accustomed to modern AR-style rifles.
FOXTROT-MSR Weapon Light
In addition to the ROMEO5 optic, this M400 Sentry package includes a SIG SAUER FOXTROT-MSR weapon-mounted light.
The factory light further distinguishes the Sentry package from a basic M400 rifle and provides another useful accessory without requiring a separate purchase.
M-LOK Handguard
The rifle features a modern M-LOK handguard that provides multiple mounting positions for compatible accessories while maintaining a streamlined profile.
The modular mounting interface gives owners flexibility when configuring the rifle with compatible accessories according to their individual preferences.
Vertical Foregrip
A vertical foregrip is included as part of the factory Sentry configuration, providing an additional interface for the support hand.
Together with the M-LOK handguard, ROMEO5 optic and FOXTROT-MSR light, the foregrip contributes to the M400 Sentry’s comprehensive factory-equipped package.
Two-Stage Matchlite Duo Trigger
The SIG SAUER M400 Sentry incorporates a two-stage Matchlite Duo trigger, providing an upgraded trigger system compared with a basic mil-spec AR trigger.
The two-stage design complements the rifle’s enhanced factory configuration and adds another performance-oriented feature to the M400 Sentry platform.
Magpul MOE SL Adjustable Stock
A six-position Magpul MOE SL stock allows the rifle’s length of pull to be adjusted to accommodate different shooters and shooting positions.
The adjustable stock combines with the familiar AR-style controls to create a versatile platform that can be configured around individual preferences.
30+1 Round Capacity
The SIG SAUER M400 Sentry includes a 30-round magazine, providing a potential 30+1 capacity when loaded with a round in the chamber.
The M400 platform accepts commonly available compatible AR-pattern magazines, further contributing to the rifle’s versatility.
Complete Factory-Equipped SIG SAUER M400
The SIG SAUER M400 Sentry stands out as a well-equipped version of the M400 platform by combining the rifle with a ROMEO5 Gen II optic, FOXTROT-MSR light, vertical foregrip and upgraded trigger system.
For shooters searching for a SIG SAUER 5.56 NATO rifle that already includes several desirable accessories, the M400 Sentry provides a compelling factory package built around the established M400 platform.
SIG SAUER M400 Sentry Features
- Manufacturer: SIG SAUER
- Model: M400 Sentry
- Caliber: 5.56 NATO
- Action: Semi-automatic
- Operating System: Direct impingement
- Barrel Length: 16 inches
- Optic: SIG SAUER ROMEO5 Gen II
- Weapon Light: SIG SAUER FOXTROT-MSR
- Trigger: Two-stage Matchlite Duo
- Handguard: M-LOK
- Foregrip: Vertical foregrip
- Stock: Six-position Magpul MOE SL
- Capacity: 30+1 rounds
- Finish: Black
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