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February 24, 2026SIG RM400SDI16BR5FX M400 SDI 556 16 BLK TELE
$1,749.99
SIG RM400SDI16BR5FX M400 SDI 556 16 BLK TELE
13 in stock
The M400 Sentry offers a ready-to-go solution, combining the M400-SDI X platform with the multi-purpose functionality of the ROMEO5 GENII red dot and the Foxtrot-MSR Full Size Light. The M400-Sentry is furnished with a vertical foregrip on the free-floating handguard, enabling greater control of the rifle regardless the shooting position. The ROMEO5 GENII red dot with its 1x aiming solution and crisp 2 MOA dot, 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. 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. Includes three M-LOK rail covers and a 30rd polymer magazine.
| UPC | 798681716128 |
|---|---|
| Manufacturer | Sig Sauer |
| Manufacturer Part Number | RM400SDI16BR5FX |
| Action | Semi-Auto |
| ATF Type | MODERN SPORTING RIFLE |
| Barrel Length | 16" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 30 |
| Length | 33.25'' |
| Magazine Included | 1 x 30-Round |
| Model | M400 |
| Number of Magazines | 1 30 rd. |
| Package Height | 4.0 |
| Package Width | 11.5 |
| Product Type | AR |
| Rate of Twist | 1:7" |
| Safety | Ambidextrous |
| Shipping Weight | 10.9 |
| Sights | No |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |





