Sig Sauer M400 Forge | 5.56 NATO | 16in | RM400-556N-16B-FORGE

The Sig Sauer M400 Forge is a purpose-built AR-style rifle chambered for 5.56 NATO featuring a 16-inch cold hammer forged barrel, a mid-length gas system, and an out-of-the-box ROMEO-MSR Gen II 2 MOA red dot. It ships with a TriggerTech two-stage flat blade duty trigger and a Magpul SL-K six-position adjustable stock for ergonomic control. This configuration is well-suited for range training and competition shooting; an optic such as the Vortex SPARC AR (commonly available under $1,000) pairs effectively with the factory optic and rail setup for fast target acquisition and durable performance.

Applications: range practice and competition shooting are two common uses for this rifle configuration.

Product Specifications

• The caliber is 5.56 NATO.
• The barrel measures 16 inches and is cold hammer forged.
• The twist rate is 1:7.
• The action type is Semi-Auto.
• The operating system is mid-length direct impingement.
• The trigger is a TriggerTech 3.5-pound two-stage flat blade duty trigger.
• The included optic is a ROMEO-MSR Gen II 2 MOA red dot.
• The handguard is a 15-inch free-floating M-LOK style with full-length Picatinny on top.
• The stock is a Magpul SL-K 6-position adjustable black polymer stock.
• The magazine capacity is 30+1 rounds with (1) 30-round polymer magazine included.
• The overall length is 35.5 inches extended and 32.25 inches collapsed.
• The weight with magazine is 6.8 lbs.
• The muzzle device is a A2 birdcage flash hider.
• The receiver finish is black Cerakote.
• The UPC is 798681744114.

Designed for shooters who value accuracy and a high-quality baseline build, the M400 Forge combines a durable cold hammer forged barrel, an intuitive two-stage TriggerTech trigger, and a factory-mounted ROMEO-MSR optic to deliver reliable, consistent performance on the range and in matches. The M-LOK handguard and full-length top rail provide straightforward accessory mounting while the adjustable SL-K stock allows for rapid fit adjustments.

Owners commonly praise the crisp feel of the TriggerTech two-stage trigger and the convenience of the included ROMEO-MSR Gen II red dot for immediate use out of the box.

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