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Sig Sauer

SIGM400, 5.56 NATO, RIFLE, 16IN, FORGE, BLK, SEMI, ROMEO-MSR GEN II, TELE STOCK, AL MLOK HG, (1) 30RD MAG

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SKU: RM400556N16BFORGE
Model: M400
UPC: 798681744114
$1,036.99
$1,099.99
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  • Product Details

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.

Specifications

ManufacturerSig Sauer
Pricing UnitGN
ModelM400
UPC798681744114
SKURM400556N16BFORGE
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