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Sig Sauer

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

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SKU: RM400556N16BFORGEFDE
Model: M400
UPC: 798681744190
$1,141.99
$1,199.99
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  • Product Details

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.

Specifications

ManufacturerSig Sauer
Pricing UnitGN
ModelM400
UPC798681744190
SKURM400556N16BFORGEFDE
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