The Sig Sauer M400 Forge 5.56 NATO Rifle With Romeo-MSR Gen II Red Dot pairs a proven AR-15 foundation with premium factory upgrades for a refined, ready-to-run setup. Its 16" cold hammer forged barrel and mid-length gas system work together to deliver smooth cycling, dependable accuracy, and reduced recoil, while the free-floating 15" M-LOK handguard and full-length Picatinny rail provide generous space for accessories and optics. A TriggerTech 3.5-pound two-stage flat blade duty trigger offers a crisp, predictable break, and the Magpul SL-K 6-position stock keeps the rifle compact, stable, and comfortable on the shoulder.

This configuration is well suited for range practice, training, and general-purpose defensive use where reliability and ease of handling matter. The included Romeo-MSR Gen II 2 MOA red dot supports fast target acquisition and simple sighting, and the ambidextrous charging handle makes operation intuitive for a wide range of shooters. With its balanced dimensions, 30-round capacity, and thoughtful feature set, the M400 Forge reflects Sig Sauer’s focus on practical performance and modern rifle craftsmanship.

Key Features:

• Manufacturer: Sig Sauer
• Model: M400 Forge
• Caliber: 5.56 NATO
• Condition: New
• Action: Semi-automatic
• Barrel Length: 16" cold hammer forged
• Capacity: 30 rounds
• Optic Footprint: Romeo-MSR Gen II 2 MOA red dot included
• Unique Features: Mid-length gas system, TriggerTech 3.5 lb two-stage flat blade trigger, 15" free-floating M-LOK handguard, ambidextrous charging handle, Magpul SL-K 6-position stock
• What's In The Box: Rifle with Romeo-MSR Gen II optic and one 30-round magazine
• Weight: 6.8 lb with magazine
• Length: 32.25"–35.5" overall
• Width: 2.7"
• Height: 7.2" without optic, 9.4" with optic