Sig Sauer M400 FORGE AR-15 rifle in OD Green with 16-inch cold hammer forged barrel, ROMEO-MSR Gen II red dot, and free-float aluminum handguard, in store image pointed to the left

Sig Sauer M400 FORGE 5.56 NATO 16" AR-15 Rifle with ROMEO-MSR Gen II - OD Green

Sig Sauer
SKU:
101-33219
|
UPC:
798681744206
$1,099.99
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Description

Sig Sauer M400 FORGE 5.56 NATO 16" AR-15 Rifle with ROMEO-MSR Gen II – OD Green

The Sig Sauer M400 FORGE delivers premium AR-15 performance with factory-installed upgrades that serious shooters demand. Chambered in 5.56 NATO, this OD Green variant combines a battle-proven operating system with high-end components for dependable performance whether you're on the range, protecting your home, or training for competition.

At the heart of the rifle is a durable 16-inch cold hammer forged barrel, engineered for superior accuracy, long service life, and consistent performance under heavy use. A lightweight free-float aluminum handguard improves rigidity while offering plenty of room for mounting lights, slings, grips, and other M-LOK accessories.

The included SIG ROMEO-MSR Gen II 2 MOA Red Dot Sight provides rapid target acquisition right out of the box, while the TriggerTech 3.5-pound two-stage flat blade trigger delivers a crisp, clean break for greater precision and faster follow-up shots.

Additional premium features include an ambidextrous charging handle, ergonomic polymer grip, adjustable stock, and a durable matte OD Green finish. The result is a versatile AR-15 that's ready for duty, defense, or the range without requiring aftermarket upgrades.

Key Features

  • Chambered in 5.56 NATO
  • 16-inch cold hammer forged barrel
  • Matte OD Green finish
  • TriggerTech 3.5 lb two-stage flat blade duty trigger
  • Factory-installed SIG ROMEO-MSR Gen II 2 MOA red dot optic
  • Free-float aluminum handguard
  • Ambidextrous charging handle
  • Adjustable stock
  • 30-round magazine included
  • Built for home defense, training, competition, and recreational shooting

Specifications

Manufacturer Sig Sauer
Model M400 FORGE
Manufacturer Part Number RM400-556N-16B-FORGE-MSGRN
UPC 798681744206
Caliber 5.56 NATO
Action Semi-Automatic
Platform AR-15
Barrel Length 16"
Barrel Type Cold Hammer Forged
Capacity 30 Rounds
Trigger TriggerTech 3.5 lb Two-Stage Flat Blade
Optic SIG ROMEO-MSR Gen II 2 MOA Red Dot
Handguard Free-Float Aluminum
Charging Handle Ambidextrous
Stock Adjustable
Grip Polymer
Finish Matte OD Green

Why Choose the Sig Sauer M400 FORGE?

The Sig Sauer M400 FORGE combines premium factory upgrades with legendary SIG reliability in one complete package. Featuring a cold hammer forged barrel, TriggerTech trigger, ROMEO-MSR Gen II optic, ambidextrous controls, and a rugged OD Green finish, it's an outstanding choice for shooters who want a high-performance AR-15 that's ready to perform from day one.