SIG SAUER M400 Forge

Description

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.