Sig Sauer M400-SDI Sentry Rifle 5.56 NATO 30rd Magazine 16" Barrel Black with Romeo5 Gen II Foxtrot
$1,749.99
The Sig Sauer M400-SDI Sentry Rifle in 5.56 NATO is a versatile, ready-to-go solution for home defense and advanced training, featuring a 16″ barrel and a 30rd magazine capacity. It combines the reliability of the M400-SDI X platform with the practicality of the ROMEO5 GEN II red dot and a vertical foregrip, making it ideal for both recreational shooting and serious applications.
8 in stock
The M400-SENTRY offers a ready-to-go solution for the most discerning shooters combining the proven capabilities of the M400-SDI X platform with the multi-purpose functionality of the ROMEO5 GENII red dot FOXTROT-MSR Full Size Light and a vertical foregrip. This combination of standardized features makes the M400-SENTRY an out-of-the-box solution for home/personal defense advanced training or recreational shooting.
Like other rifles in the series the M400-SENTRY was developed based on the direct input of professional instructors at SIG SAUER Academy. Their decades of combined experience and personal knowledge ensures that all M400 rifles are designed to meet the highest standards of reliability and performance.
Adding to the advanced capabilities of the M400 platform is the pre-installed ROMEO5 GENII red dot FOXTROT-MSR Full Size Light and vertical foregrip. With its 1x aiming solution and crisp 1 MOA dot the ROMEO5 GENII provides over 40000 hours of estimated runtime compliments of SIG SAUER’s motion-activated MOTAC design. The ROMEO5 GENII is IPX7 waterproof rated and its fully-multicoated lenses ensure visibility in all environments. Top mount illumination controls provide ease of use by both left and right-handed shooters.
For added visibility in low-light conditions the FOXTROT-MSR Full Size Light with its 1250 Lumens and 33000 Candela clearly illuminates targets while maintaining ease of use and accessibility. The M400-SENTRY is also furnished with a vertical foregrip on the free-floating handguard enabling greater control of the rifle regardless the shooting position.
FEATURES INCLUDE:
- ROMEO5 GENII Red Dot FOXTROT-MSR Full Size Light and Vertical Foregrip
- Fully Ambidextrous Controls (Safety Charging Handle Bolt Catch & Release)
- Free-Floating M-LOK Forend
- (3) M-LOK Rail Covers Included
- SIG 2-Stage Matchlite Duo Trigger
- 16” Chrome/Moly Steel Barrel with 1:7 Twist Rate
- 6-Position Magpul MOE-SL Stock
- Low Profile Gas Block with Mid-Length Operating System
| Weight | 10.800 lbs |
|---|---|
| Dimensions | 46.500 × 11.500 × 4.250 in |
| Manufacturer | Sig Sauer |
PROCESSING & SHIPPING
Orders typically ship within 1–3 business days (Monday–Friday) after payment and all required documentation are received. Time to arrival after shipment depends on the carrier. Shipping method is at BT Gun Company’s discretion; ammunition and oversized accessories are charged at actual shipping cost. We do not ship to Hawaii or Alaska.
FIREARM TRANSFERS
- Firearms must ship to a licensed FFL dealer of your choosing — confirm with them first that they can accept the transfer.
- Your receiving FFL will need to email their license to [email protected] before we can ship.
- Inspect your firearm at your FFL’s location before signing ATF Form 4473 — once signed, the firearm is considered accepted.
You’re responsible for knowing the firearms laws in your state before ordering. For complete shipping, returns, and restocking-fee policy details, see our Shipping & Returns page.
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