SIG Sauer M400 Sentry Rifle with ROMEO5 Gen II and FOXTROT-MSR, 5.56 NATO, 16-Inch, 30-Round

Description

SIG Sauer M400 Sentry Rifle with ROMEO5 Gen II and FOXTROT-MSR, 5.56 NATO, 16-Inch, 30-Round

The SIG M400 Sentry is the SDI X that leaves the factory ready: Academy ambidextrous controls, a ROMEO5 Gen II, a FOXTROT-MSR full-size light, and a vertical foregrip already on the rifle.

SDI X is SIG Academy’s AR. Instructors asked for a fully ambidextrous rifle, including a bolt catch unique to the SDI lower, so left- and right-handed shooters run the same gun. A dual-clamp steel lockup keeps the M-LOK handguard rigid when lights and grips hang on all four sides. The Matchlite Duo two-stage is a flat 4.5–6.5 lb pull.

Sentry is the SDI X that leaves the factory ready. Academy ambidextrous controls, including the SDI bolt catch, plus a ROMEO5 Gen II, a FOXTROT-MSR full-size light, and a vertical foregrip already on the rifle. SIG lists the FOXTROT-MSR at 1,250 lumens and 33,000 candela. Three M-LOK rail covers ship in the box. Weight with the package is 8.0 lb. Height is 9.3 in.

This Sentry package

Sentry is the equipped SDI X, not a bare 16 in. rifle. SIG mounts the ROMEO5 Gen II, the FOXTROT-MSR full-size light, and a vertical foregrip at the factory. Three M-LOK rail covers and one 30-round magazine ship in the box. Weight is 8.0 lb. Height is 9.3 in.

What ships

The iron-sight SDI X is the same lower without the optic, light, and grip. This is a serialized 5.56 rifle and ships to a licensed FFL.

Specifications and Included Items

• Model: RM400-SDI-16B-R5FX
• Caliber: 5.56 NATO
• Barrel: 16 in. chrome/moly steel, 1:7 twist, 1/2-28 tapered shoulder
• Muzzle: SIG flash-hider compensator
• Operating system: Mid-length direct impingement
• Trigger: SIG 2-stage Matchlite Duo, flat
• Controls: Fully ambidextrous, including SDI bolt catch/release
• Optic: Factory ROMEO5 Gen II
• Light: Factory FOXTROT-MSR full-size; SIG lists 1,250 lumens / 33,000 candela
• Handguard: Free-float M-LOK with factory vertical foregrip; three M-LOK rail covers included
• Stock: 6-position Magpul MOE-SL, black
• Finish: Black anodized
• Overall length: 36.5 in. extended, 33.25 in. collapsed
• Height: 9.3 in.
• Weight: 8.0 lb
• Magazine included: One 30-round polymer AR-15 magazine
• FFL: Rifle; ships to a licensed FFL dealer