The Sig Sauer M400 Forge w/ Romeo-MSR Gen II is a modern 5.56 NATO semi-automatic rifle built around a 16" cold hammer forged, threaded barrel and a mid-length direct impingement gas system. Its Concrete Gray Cerakote alloy receiver, 15" free-floating M-LOK handguard, and included ROMEO-MSR Gen II 2 MOA red dot create a balanced platform focused on consistency, control, and clean handling right out of the box.

This configuration uses a TriggerTech 3.5 lb two-stage flat blade duty trigger for a predictable break and improved shot-to-shot precision. An ambidextrous charging handle, reduced-angle grip, and Magpul SL-K 6-position adjustable stock support a wide range of shooters and shooting positions, making it well suited for range work, training, and general-purpose defensive roles. Sig Sauer’s attention to detail and long-standing reputation for dependable firearms is evident throughout the M400 Forge series.

Key Features:

• Manufacturer: Sig Sauer
• Model: M400 Forge RM400-556N-16B-FORGE-CON
• Caliber: .223 Remington / 5.56 NATO
• Condition: New
• Action: Semi-Automatic
• Barrel Length: 16"
• Number of Magazines: 1
• Capacity: 30+1
• Optic Footprint: ROMEO-MSR Gen II 2 MOA Red Dot
• Unique Features: TriggerTech 3.5 lb Two-Stage Flat Blade Trigger, Mid-Length Gas System, 15" Free-Floating M-LOK Handguard, Ambidextrous Charging Handle, Magpul SL-K Adjustable Stock
• Night Sights: No
• External Safety: Ambidextrous Manual Safety
• Threaded Barrel: Yes (1/2x28 with A2 Birdcage Flash Hider)
• What's In The Box: Rifle, ROMEO-MSR Gen II Optic, (1) 30-Round Magazine
• Weight: 6.8 lbs
• Length: 32.25"–35.5"
• Width: 2.7"