Overview

The SIGM400 5.56 NATO rifle combines a 16 in barrel platform with a modern Romeo-MSR Gen II optic setup, a telescoping stock, and an AL M-LOK handguard to deliver a compact, ready-to-mount configuration for precision aiming and fast target acquisition.

Key Features

• Caliber: 5.56 NATO
• Action: Semi-automatic
• Barrel length: 16 in
• Finish/color: Black
• Optics compatibility: Romeo-MSR Gen II
• Stock: Telescoping
• Handguard system: AL M-LOK HG
• Magazine included: (1) 30 rd mag

Specifications

• Product name: SIGM400
• Firearm type: Rifle
• Barrel profile/length designation: 16IN
• Upper/forging designation: FORGE
• Model designation: ROMEO-MSR GEN II
• Accessory designation: TELE STOCK
• Handguard designation: AL MLOK HG
• Magazine capacity: 30 rounds

Benefits

• Integrated optic-ready configuration: Supports a Romeo-MSR Gen II mounting arrangement for an established sighting system.
• Compact 16 in form factor: Optimized proportions for maneuvering while maintaining a rifle-length barrel.
• Telescoping stock: Provides adjustable length-of-pull for consistent shoulder fit.
• M-LOK handguard interface: Enables mounting of compatible accessories along the handguard for organized setup.

Use Cases

• Range sessions requiring a 5.56 NATO semi-automatic rifle with a 16 in barrel
• Training that benefits from a telescoping stock and an optic-mounted layout
• Target work using a 30 rd magazine for extended strings

Why Choose SIGM400

The SIGM400 is specified with a 16 in 5.56 NATO semi-automatic rifle build, a Romeo-MSR Gen II optic configuration, an adjustable telescoping stock, and an AL M-LOK handguard, packaged with a 30 rd magazine in a black finish for a cohesive, assembled configuration.