Sig Sauer M400 Forge 5.56 Rifle with 16.5-Inch Barrel, Flat Dark Earth Finish, Romeo MSR Gen2, and Magpul SL-K Stock

Product Overview

The SIGM400 5.56 NATO RIFLE is a 16-inch semi-automatic AR-platform configuration featuring a Romeo-MSR Gen II optic, a telescoping stock, an aluminum M-LOK handguard, and an FDE finish. The package includes one 30-round magazine.

Key Features

• Caliber: 5.56 NATO
• Action: Semi-automatic
• Barrel length: 16 in
• Handguard: Aluminum M-LOK HG
• Stock: Telescoping (tele stock)
• Optic: Romeo-MSR Gen II
• Finish: FDE
• Included magazine: (1) 30RD MAG

Specifications

• Model: SIGM400
• Firearm type: Rifle
• Cartridge: 5.56 NATO
• Operating mode: Semi (semi-automatic)
• Barrel length: 16 in
• Handguard system: AL M-LOK
• Optics system: ROMEO-MSR GEN II
• Stock configuration: Tele stock
• Color/finish: FDE
• Magazine capacity: 30 rounds

Benefits

• Integrated optic platform: Romeo-MSR Gen II supports rapid target acquisition with a red-dot style sighting system.
• M-LOK handguard: Aluminum M-LOK HG provides accessory mounting interfaces for configurable setups.
• Telescoping stock: Adjustable length of pull supports consistent cheek weld and sight alignment across varying positions.
• 16-inch configuration: Balances compact handling with a standard rifle-length sighting geometry.

Use Cases

• Range sessions requiring a ready-to-mount optic configuration
• Training drills benefiting from adjustable stock geometry
• Configurations using M-LOK accessory mounting on a 16-inch rifle build

Why Choose This SIGM400 Build

This SIGM400 configuration pairs a 16-inch 5.56 NATO semi-automatic rifle with a Romeo-MSR Gen II optic, an aluminum M-LOK handguard, and a telescoping stock, delivered with a 30-round magazine and finished in FDE.

The Sig Sauer M400 Forge in 5.56 NATO caliber offers a reliable semi-automatic platform designed for versatility and performance. Featuring a 16.5-inch cold hammer-forged steel barrel with a 1:7 twist rate, this rifle delivers consistent accuracy suitable for both tactical use and target shooting. The flat dark earth Cerakote finish on the receiver and barrel provides enhanced durability and corrosion resistance, making it ideal for challenging environments. Equipped with an M-Lok handguard and Picatinny rail, this rifle is ready for accessories and optics, enhancing customization options for the user.

Features:

• Barrel: 16.5-inch cold hammer-forged steel barrel with a 1:7 twist rate for precision shooting

• Finish: Flat Dark Earth Cerakote on receiver and barrel for durability and corrosion resistance

• Stock: Magpul SL-K polymer stock in black, designed for comfortable handling and stability

• Sights: Optics-ready with Picatinny rail for easy mounting of optics and accessories

• Magazine: Detachable 30-round magazine for extended shooting sessions

• Action: Semi-automatic with TriggerTech Two Stage trigger for smooth, consistent firing

• Handguard: M-Lok system for accessory attachment and customization

• Overall Length: Adjustable from approximately 32.25 to 35.50 inches for versatile handling

• Weight: Approximately 6.8 pounds, balancing maneuverability and stability

• Construction: Alloy receiver with flat dark earth Cerakote finish, built for durability and long-term use

Compliance Notice

This product is intended for lawful use only. Restrictions may apply based on state or local laws.