Sig Sauer M400 Forge 5.56 16in | ROMEO-MSR | RM400-556N-16B-FORGE-CA

The Sig Sauer M400 Forge is a semi-automatic modern sporting rifle built around a 16-inch cold hammer forged barrel with a mid-length gas system and an included ROMEO-MSR Gen II 2 MOA red dot sight. It ships CA-compliant with a 10-round polymer magazine and a TriggerTech two-stage 3.5-pound flat blade trigger. For optics, a compact red-dot such as the Vortex SPARC AR or Holosun HS510C will pair well and stay under $1,000 while matching the ROMEO-MSR’s close-to-mid-range capability.

Recommended uses for this platform include range training and competitive/practical target shooting, where reliability, a crisp two-stage trigger, and a low-profile optic deliver consistent results.

Product Specifications

• The firearm is a Rifle.
• The caliber is 5.56 NATO.
• The barrel measures 16 in.
• The barrel material is Cold Hammer Forged Steel.
• The twist rate is 1:7.
• The included sight is a ROMEO-MSR Gen II w/2 MOA dot.
• The barrel threads are 1/2 in – 28.
• The muzzle device is an A2 Birdcage Flash Hider.
• The action type is Semi-Auto.
• The operating system is Mid-Length Direct Impingement.
• The handguard is a Full-length free-floating M-LOK handguard.
• The trigger is a TriggerTech 3.5-Pound 2-Stage Flat Blade.
• The magazine capacity is 10 + 1.
• Included magazines are (1) 10rd Polymer Mag.
• The UPC is 798681744138.

The M400 Forge presents a familiar AR ergonomics package with an upgraded trigger and a factory-mounted ROMEO-MSR red dot to simplify setup out of the box. Its cold hammer forged barrel and full-length M-LOK handguard deliver a stable, serviceable platform for sustained range sessions and competition work. If you prefer a slightly different optic footprint than the supplied ROMEO-MSR, the compact red-dot options noted above provide durable, repeatable aiming at distances where the platform excels.

Users commonly praise the M400 Forge for its crisp TriggerTech two-stage trigger and the convenience of the factory-mounted ROMEO-MSR optic; they also note that the rifle arrives ready for range use with a single 10-round magazine included.

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