SIG M400 5.56 16" Rifle with Romeo5 Red Dot - 30rd Black

The SIG M400 delivers reliable semi-automatic performance with an integrated Romeo5 red dot optic for immediate target acquisition. This carbine-length rifle combines proven direct impingement operation with modern tactical features in a versatile platform.

What Makes This Different

The M400 features SIG's enhanced trigger group and free-floating M-LOK handguard for improved accuracy over standard carbine configurations. The included Romeo5 red dot sight mounts directly to the flattop receiver, eliminating the need for separate optic purchases. Factory-installed components ensure proper headspace and reliable function from the first round.

Key Features

• Romeo5 2 MOA red dot sight with 50,000-hour battery life
• 16-inch chrome-moly vanadium barrel with 1:7 twist rate
• Free-floating 13-inch M-LOK handguard with full-length top rail
• Enhanced single-stage trigger with crisp break
• Six-position telescoping stock with standard carbine buffer system
• 30-round Magpul PMAG included
• Ambidextrous safety selector and magazine release

The 16-inch barrel length provides optimal velocity for 5.56 NATO cartridges while maintaining maneuverability in confined spaces. The Romeo5's parallax-free design maintains zero across temperature extremes, making this combination effective for competitive shooting, patrol duties, and recreational use. The M-LOK attachment system accommodates accessories without adding unnecessary weight or bulk.

Technical Specs

• Caliber: 5.56 NATO/.223 Remington
• Barrel Length: 16 inches, 1:7 twist rate
• Overall Length: 32.5-35.5 inches (stock collapsed/extended)
• Weight: 7.1 pounds (with optic)
• Handguard: 13-inch free-floating M-LOK
• Magazine Capacity: 30 rounds
• Finish: Hard coat anodized black
• Made in USA

The factory-matched Romeo5 optic eliminates guesswork in sight selection and mounting. Professional armorers can verify proper installation, but the integrated package reduces setup time and ensures compatibility. This configuration represents proven reliability in a ready-to-use format.