SIG Sauer M400 ROSE | 5.56 NATO | 16" | ROSE Accents | Romeo5 | 30rd Rifle

The SIG Sauer M400 ROSE (MPN: RM40016BROSER5X2) is a 5.56 NATO AR-15-style rifle developed as part of SIG’s ROSE training and product program. It combines a lightweight 16-inch rifle configuration with ambidextrous controls, a factory ROMEO5 Gen II red-dot sight, and distinctive ROSE-branded accents for a complete ready-to-train package.

The M400 ROSE uses a 16-inch chrome-moly steel barrel with 1:7 twist, mid-length operating system, and a 10-inch free-floating M-LOK handguard with ROSE engraving. SIG adds a six-position Magpul SL stock, ROSE-engraved AR-style grip, foregrip, and matte rose-gold-colored controls. The included ROMEO5 Gen II optic arrives mounted to the rifle, reducing the amount of setup required before range use.

Key Features & Capabilities

• 16-Inch 5.56 NATO Barrel: 1:7 twist chrome-moly barrel with mid-length gas system.
• ROMEO5 Gen II Included: Factory red-dot optic provides an immediate sighting solution.
• 10-Inch M-LOK Handguard: Free-floating rail with ROSE branding and accessory mounting space.
• Ambidextrous Controls: Designed for convenient manipulation from either side.
• ROSE Furniture & Accents: Grip, controls, and markings distinguish this configuration.

The M400 ROSE is designed for buyers who want a complete SIG rifle-and-optic package tied into the ROSE training ecosystem. Browse AR-15 rifles or shop .223 / 5.56 ammunition.