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  • Home
  • About Us
  • Everything you need to know about reloading
    Start Shopping
      Reloading Dies
      Reloading Presses & Accessories
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      Reloading Components
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M400-SENTRY 5.56X45 NATO SEMI-AUTO RIFLE WITH ROMEO5 GENII - M400-SENTRY 5.56X45 NATO 16''BBL (1)30RD BLACK W/ROMEO5 GENII

M400-SENTRY 5.56X45 NATO SEMI-AUTO RIFLE WITH ROMEO5 GENII – M400-SENTRY 5.56X45 NATO 16”BBL (1)30RD BLACK W/ROMEO5 GENII

[cfs_specs_box]
SIG SAUER M400-SENTRY 5.56X45 NATO SEMI-AUTO RIFLE WITH ROMEO5 GENII
 
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 40,000 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 1,250 Lumens and 33,000 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:
  • 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
SPECIFICATIONS:
  • CALIBER: 5.56×45 NATO
  • SIGHTS: ROMEO5 GENII Installed
  • BARREL LENGTH: 16 in [406.4 mm]
  • BARREL MATERIAL: Chrome/Moly Steel
  • BARREL TWIST: 1:7
  • THREADS: 1/2 in – 28 tpi tapered shoulder
  • MUZZLE DEVICE: SIG Flash Hider-Compensator
  • ACTION TYPE: Semi-Auto
  • OPERATING SYSTEM: Mid-Length Direct Impingement
  • STOCK TYPE: 6-Position Magpul MOE-SL, Black
  • GRIP TYPE: Reduced Angle
  • TRIGGER TYPE: SIG 2-Stage Matchlite Duo
  • TRIGGER SHAPE: Flat
  • FOREND TYPE: Free-Floating M-LOK Alloy
  • ACCESSORY RAIL: M-LOK/Picatinny, ROMEO5 GEN II, FOXTROT-MSR FULL SIZE, Vertical Foregrip
  • MAG TYPE: AR-15
  • MAGS INCLUDED: (1) 30 Round Polymer Mag
  • COLOR: Black
  • RECEIVER FINISH: Anodized
  • OVERALL LENGTH: 36.5 in
  • COLLAPSED LENGTH: 33.25 in
  • OVERALL WIDTH: 2.8 in
  • HEIGHT: 9.3 in
  • WEIGHT: 8.0 LB
Description

Original price was: $1,749.99.Current price is: $1,484.00.

SIG SAUER M400-SENTRY 5.56X45 NATO SEMI-AUTO RIFLE WITH ROMEO5 GENII
 
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 40,000 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 1,250 Lumens and 33,000 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:
  • 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
SPECIFICATIONS:
  • CALIBER: 5.56×45 NATO
  • SIGHTS: ROMEO5 GENII Installed
  • BARREL LENGTH: 16 in [406.4 mm]
  • BARREL MATERIAL: Chrome/Moly Steel
  • BARREL TWIST: 1:7
  • THREADS: 1/2 in – 28 tpi tapered shoulder
  • MUZZLE DEVICE: SIG Flash Hider-Compensator
  • ACTION TYPE: Semi-Auto
  • OPERATING SYSTEM: Mid-Length Direct Impingement
  • STOCK TYPE: 6-Position Magpul MOE-SL, Black
  • GRIP TYPE: Reduced Angle
  • TRIGGER TYPE: SIG 2-Stage Matchlite Duo
  • TRIGGER SHAPE: Flat
  • FOREND TYPE: Free-Floating M-LOK Alloy
  • ACCESSORY RAIL: M-LOK/Picatinny, ROMEO5 GEN II, FOXTROT-MSR FULL SIZE, Vertical Foregrip
  • MAG TYPE: AR-15
  • MAGS INCLUDED: (1) 30 Round Polymer Mag
  • COLOR: Black
  • RECEIVER FINISH: Anodized
  • OVERALL LENGTH: 36.5 in
  • COLLAPSED LENGTH: 33.25 in
  • OVERALL WIDTH: 2.8 in
  • HEIGHT: 9.3 in
  • WEIGHT: 8.0 LB

Out of stock

SKU 430113883 Category

Description

SIG SAUER M400-SENTRY 5.56X45 NATO SEMI-AUTO RIFLE WITH ROMEO5 GENII
 
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 40,000 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 1,250 Lumens and 33,000 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:
  • 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
SPECIFICATIONS:
  • CALIBER: 5.56×45 NATO
  • SIGHTS: ROMEO5 GENII Installed
  • BARREL LENGTH: 16 in [406.4 mm]
  • BARREL MATERIAL: Chrome/Moly Steel
  • BARREL TWIST: 1:7
  • THREADS: 1/2 in – 28 tpi tapered shoulder
  • MUZZLE DEVICE: SIG Flash Hider-Compensator
  • ACTION TYPE: Semi-Auto
  • OPERATING SYSTEM: Mid-Length Direct Impingement
  • STOCK TYPE: 6-Position Magpul MOE-SL, Black
  • GRIP TYPE: Reduced Angle
  • TRIGGER TYPE: SIG 2-Stage Matchlite Duo
  • TRIGGER SHAPE: Flat
  • FOREND TYPE: Free-Floating M-LOK Alloy
  • ACCESSORY RAIL: M-LOK/Picatinny, ROMEO5 GEN II, FOXTROT-MSR FULL SIZE, Vertical Foregrip
  • MAG TYPE: AR-15
  • MAGS INCLUDED: (1) 30 Round Polymer Mag
  • COLOR: Black
  • RECEIVER FINISH: Anodized
  • OVERALL LENGTH: 36.5 in
  • COLLAPSED LENGTH: 33.25 in
  • OVERALL WIDTH: 2.8 in
  • HEIGHT: 9.3 in
  • WEIGHT: 8.0 LB

Additional information

Weight 8.5 lbs
Front Sight

None
Muzzle

Flash Hider
Barrel Length

16''
Rear Sight

Optic
Cartridge

AKK_5.56 x 45
Stock Material

Polymer
Make

Sig Sauer
Length

33.25''
Model

M400
Magazine Type

Removable
Weight

8 lbs
Action Type

Semi-Auto
Magazine Included

1 x 30-Round
Finish

Black
Make/Model

Sig Sauer, M400
Capacity

30+1-Round

Frequently Asked Questions

Are these brass cases and reloading components factory-new or once-fired? +

We stock both premium factory-new components and high-quality once-fired brass. Please check the specific product listing title and description carefully; once-fired brass is fully inspected, but we always recommend resizing and inspecting prior to priming and powder charging.

Will this case trimmer gauge or die set work with my progressive press setup? +

Our standard reloading dies and case length trimmer accessories utilize industry-standard threads (typically 7/8"-14) compatible with major single-stage, turret, and progressive presses like RCBS, Hornady, Lee Precision, and Dillon. Caliber-specific trim gauges must match your exact brass caliber.

Do you enforce shipping restrictions on powder, primers, or live ammunition? +

Yes. Non-hazardous reloading equipment (dies, case length trimmers, gauges, and unprimed brass) ships via standard ground carriers with no extra fees. Any orders containing smokeless powders or primers will incur standard federal HazMat handling fees and cannot be shipped via air transportation.

How can I track my shipment to ensure delivery safety? +

Precision reloading gear is valuable, so all orders are shipped with tracking enabled. As soon as your package is dispatched from our inventory warehouse, a tracking number will be emailed to you. You can monitor your shipment directly on our Track Order page using your unique Order ID.

Can I return precision measuring tools or die components if they don’t fit? +

We accept returns on unused, unaltered tools, case preparation equipment, and unopened component boxes within 30 days of item delivery. Due to safety and strict quality control on the reloading bench, we absolutely cannot accept returns on opened packs of primers, smokeless powder, or processed brass casings.

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