SIG Sauer M400 Forge 5.56mm Semi-Auto Pistol 11.5in with ROMEO-MSR Gen II Red-Dot Sight

The Sig Sauer M400 Forge pistol was built for shooters who need full AR-15 performance in a tighter, more agile package. The 11.5" cold hammer forged steel barrel with FNC finish punches well above its size class, delivering consistent accuracy and corrosion-resistant durability across a wide range of conditions. Paired with a carbine-length gas system tuned for reliable cycling at this barrel length, the platform stays smooth and controllable even under rapid fire.

The 10" M-LOK handguard keeps weight low while opening up plenty of real estate for lights, lasers, and other accessories along the full Picatinny rail. Chambered as a true 5.56 AR-15 pistol, the M400 Forge pairs the Magpul BSL arm brace with a crisp 3.5-pound TriggerTech pull, giving shooters a stable, confidence-inspiring hold without the bulk of a full-length stock. The ambidextrous charging handle ensures smooth, natural operation regardless of which hand leads.

Sig Sauer M400 Forge Specifications

• Manufacturer: Sig Sauer
• Model: M400 Forge
• Caliber: 5.56 NATO
• Barrel Length: 11.5"
• Barrel Material: Cold hammer forged steel
• Barrel Finish: FNC
• Barrel Twist: 1:7"
• Overall Length: 27.8" collapsed, 29.8" extended
• Overall Height: 9.4" with optic, 7.2" without optic
• Overall Width: 2.7"
• Weight: 6.2 lb. with magazine
• Magazine Capacity: 30 rounds
• Frame Material: Alloy
• Frame Finish: Anodize
• Trigger: TriggerTech 3.5-pound two-stage flat blade duty trigger
• Sights: ROMEO-MSR Gen II, 2MOA red dot
• Brace: Magpul BSL arm brace
• Handguard: 10" M-LOK with full Picatinny rail
• Charging Handle: Ambidextrous