SIG SAUER RM400 SENTRY 5.56 RIFLE 16" BLACK ROMEO5 G2, FOXTROT MSR F.S. 1-30RD MAG - $1749.99 +Free Shipping

Description

Sig Sauer M400-Sentry SDI XSeries 5.56 NATO Rifle – 16" Barrel, ROMEO5 Gen II, Foxtrot Light, Vertical Foregrip
Now Available at BattleHawk Armory – A Complete, Ready-to-Go AR Package

The Sig Sauer M400-Sentry SDI XSeries offers a turnkey solution for shooters seeking a high-performance 5.56 NATO rifle. This ready-to-go package includes a ROMEO5 GEN II red dot sight, FOXTROT-MSR™ Full-Size Rail-Mounted Light, and a vertical foregrip, all installed on the M400-SDI X platform—ensuring speed, precision, and superior low-light capability. Built around Sig’s mid-length direct impingement operating system, this AR-style rifle delivers outstanding reliability, a lightweight 16" barrel, and premium ergonomics.

Key Features
ROMEO5 GEN II Red Dot Sight
Rapid target acquisition with a 2 MOA dot.
Motion-activated illumination technology ensures extended battery life and instant-on activation.
FOXTROT-MSR™ Full-Size Light
Optimized for tactical illumination in low-visibility conditions.
Rail-mounted for easy attachment/detachment and intuitive handling.
16" Chrome/Moly Steel Barrel
1:7" twist rate ideal for stabilizing heavier 5.56 bullets.
1/2 in - 28 tpi threads with SIG Flash Hider-Compensator for reduced muzzle rise.
Mid-Length Gas System
Smoother recoil impulse for improved handling and faster follow-up shots.
Direct impingement ensures consistency and reliability.
Ambidextrous Controls & 2-Stage MatchLite Duo Trigger
Enhanced fire control for precision and control.
Ambidextrous safety suitable for both right- and left-handed shooters.
M-LOK Free-Floating Alloy Handguard
Provides superior rigidity and minimal barrel contact for maximum accuracy.
Equipped with Picatinny rail sections to mount optics, lights, and foregrips.
Complete Accessories
Vertical Foregrip for enhanced weapon control and maneuverability.
6-Position Magpul MOE-SL Stock for easy length-of-pull adjustments.
Reduced Angle Grip for improved ergonomics.

Specifications
Model: RM400-SDI-16B-R5FX
Caliber: 5.56 NATO
Barrel Length: 16 in (406.4 mm)
Barrel Material: Chrome/Moly Steel
Twist Rate: 1:7
Thread Pitch: 1/2 in - 28 tpi (tapered shoulder)
Muzzle Device: SIG Flash Hider-Compensator
Operating System: Mid-Length Direct Impingement
Trigger: SIG 2-Stage Matchlite Duo (Flat)
Stock/Brace: 6-Position Magpul MOE-SL (Black)
Handguard: Free-Floating M-LOK Alloy (includes FOXTROT-MSR Light & Vertical Foregrip)
Grip: Reduced Angle
Sights: ROMEO5 GEN II Red Dot (installed)
Magazine Included: One (1) 30-round Polymer Mag
Weight (Approx.): 8.0 lb
Overall Length: 36.5 in (extended) / 33.25 in (collapsed)
Finish: Black Anodized
Forward Assist: Yes

Why Choose the Sig Sauer M400-Sentry SDI XSeries?
Complete Package – Includes red dot, rail-mounted light, and foregrip for instant readiness.
Mid-Length Gas System – Reduces recoil, boosts handling, and extends component life.
Precision & Reliability – SIG’s build quality and 2-Stage MatchLite Duo Trigger ensure accurate, consistent shots.
Ambidextrous Controls – Accommodates right- or left-handed operation, improving ease of use.
Trusted Sig Sauer Engineering – A name synonymous with duty-grade performance and unmatched craftsmanship.

SKU: RM400-SDI-16B-R5FX