great lakes firearms logo
  • Shop
  • About
  • Services
    • Engraved Guns
    • Light Gunsmithing
    • Ultrasonic Gun Cleaning
  • Contact
$0.00 0 Cart
  • Ammo
    • Handgun Ammunition
    • Rifle Ammunition
    • Rimfire Ammunition
    • Shotgun Shells
  • Guns
    • Combination Guns
    • Derringers
  • Handguns
    • Semi Auto Handguns
    • Single Shot Handguns
    • Revolvers
    • Other Handguns
  • Magazines
    • AK Magazines
    • Handgun Magazines
    • Rifle Magazines
    • Shotgun Magazines
  • Optics
    • Binoculars
    • Gun Scopes
    • Gun Sights
    • Laser Sights
    • Night Vision
    • Range Finders
    • Red Dots Sights
    • Sight Magnifiers
    • Spotting Scopes
    • Thermal Sights
  • Rifles
    • AR Rifles
    • AK Rifles
    • Bolt Action Rifles
    • Lever Action Rifles
    • Pump Action Rifles
    • Semi Auto Rifles
    • Single Shot Rifles
    • Other Rifles
  • Parts
    • AR Lower Parts
    • AR Lower Parts Kits
    • AR Upper Parts
    • AR15 Parts
    • Class 3 Parts & Accessories
    • Glock Parts
    • Gun Parts
    • Gun Parts Kits
    • Handgun Parts
    • Other AR15 Accessories & Parts
  • Shotguns
    • Bolt Action Shotguns
    • Lever Action Shotguns
    • Over Under Shotguns
    • Pump Action Shotguns
    • Semi Auto Shotguns
    • Single Shot Shotguns
    • Side By Side Shotguns
    • Other Shotguns
  • Scopes
    • Scope Accessories & Scope Parts
    • Sight Magnifiers
    • Spotting Scopes
    • Thermal Sights
  • Pre-Owned
  • NFA/Supressor
great lakes firearms logo
  • Ammo
    • Handgun Ammunition
    • Rifle Ammunition
    • Rimfire Ammunition
    • Shotgun Shells
  • Guns
    • Combination Guns
    • Derringers
  • Handguns
    • Semi Auto Handguns
    • Single Shot Handguns
    • Revolvers
    • Other Handguns
  • Magazines
    • AK Magazines
    • Handgun Magazines
    • Rifle Magazines
    • Shotgun Magazines
  • Optics
    • Binoculars
    • Gun Scopes
    • Gun Sights
    • Laser Sights
    • Night Vision
    • Range Finders
    • Red Dots Sights
    • Sight Magnifiers
    • Spotting Scopes
    • Thermal Sights
  • Rifles
    • AR Rifles
    • AK Rifles
    • Bolt Action Rifles
    • Lever Action Rifles
    • Pump Action Rifles
    • Semi Auto Rifles
    • Single Shot Rifles
    • Other Rifles
  • Parts
    • AR Lower Parts
    • AR Lower Parts Kits
    • AR Upper Parts
    • AR15 Parts
    • Class 3 Parts & Accessories
    • Glock Parts
    • Gun Parts
    • Gun Parts Kits
    • Handgun Parts
    • Other AR15 Accessories & Parts
  • Shotguns
    • Bolt Action Shotguns
    • Lever Action Shotguns
    • Over Under Shotguns
    • Pump Action Shotguns
    • Semi Auto Shotguns
    • Single Shot Shotguns
    • Side By Side Shotguns
    • Other Shotguns
  • Scopes
    • Scope Accessories & Scope Parts
    • Sight Magnifiers
    • Spotting Scopes
    • Thermal Sights
  • Pre-Owned
  • NFA/Supressor
$0.00 0 Cart
Click to enlarge
Home Guns & Firearms Rifles Semi Auto Rifles Sig Sauer M400 Forge Concrete Gray Rifle 5.56 NATO 30rd Magazine 16″ Barrel ROMEO-MSR GEN II Adjustable Stock M-LOK Handguard
GFORCE ARMS JAWBONE HYBRID - 45ACP PISTOL 7" BBL 26RD BLACK
GFORCE ARMS JAWBONE HYBRID - 45ACP PISTOL 7" BBL 26RD BLACK $529.00
Back to products
ATI ALPHA MAXX HGA 5.56 7.5" PISTOL W/7" POLY MLOK HANGUARD FLAT TOP W/BRACE
ATI ALPHA MAXX HGA 5.56 7.5" PISTOL W/7" POLY MLOK HANGUARD FLAT TOP W/BRACE $352.00

Sig Sauer M400 Forge Concrete Gray Rifle 5.56 NATO 30rd Magazine 16″ Barrel ROMEO-MSR GEN II Adjustable Stock M-LOK Handguard

$1,099.99

Sig Sauer M400 Forge Concrete Gray Rifle 5.56 NATO 30rd Magazine 16″ Barrel ROMEO-MSR GEN II Adjustable Stock M-LOK Handguard

1 in stock

Purchase & earn 1,100 points!
Compare
Add to wishlist
SKU: LIP|SIRM40055616FCN Category: Semi Auto Rifles Brand: SIG SAUER
Share:
  • Description
  • Additional information
  • Reviews (0)
  • Shipping & Delivery
Description

Features:

  • TriggerTech 3.5 pound two-stage flat blade duty trigger
  • 16" cold hammer forged barrel with mid-length gas system
  • ROMEO-MSR Gen II 2 MOA red dot included
  • Full-length free-floating M-LOK handguard
  • Ambidextrous charging handle
  • MAGPUL SL-K 6-Position adjustable stock

Specifications:

  • FIREARM TYPE: Rifle
  • CALIBER: 5.56 NATO
  • SIGHTS: ROMEO-MSR GEN II w/2 MOA DOT
  • BARREL LENGTH: 16 in [406.4 mm]
  • BARREL MATERIAL: Cold Hammer Forged Steel
  • TWIST RATE: 1:7
  • THREADS: 1/2 in – 28 90 Degree Shouldered
  • MUZZLE DEVICE: A2 Birdcage Flash Hider
  • ACTION TYPE: Semi-Auto
  • OPERATING SYSTEM: Mid-Length Direct Impingement
  • STOCK TYPE: 6-Position Magpul SL-K
  • GRIP TYPE: Reduced Angle
  • TRIGGER TYPE: TriggerTech 3.5-Pound 2-Stage Flat Blade
  • TRIGGER SHAPE: Flat
  • MANUAL SAFETY: Ambidextrous
  • FOREND TYPE: M-LOK Concrete Gray Cerakote
  • ACCESSORY RAIL: M-LOK/Full-Length Picatinny
  • MAG TYPE: AR-15
  • MAGS INCLUDED: (1) 30rd Polymer Mag
  • COLOR: Concrete Gray
  • RECEIVER FINISH: Concrete Gray Cerakote
  • OVERALL LENGTH: 35.5 in [901.7 mm]
  • COLLAPSED LENGTH: 32.25 in
  • OVERALL WIDTH: 2.7 in [68.58 mm]
  • HEIGHT: 9.4 in [819.15 mm]
  • WEIGHT: 6.8 lb [3084.43 kg]

 

Additional information
UPC

798681744183

Manufacturer

SIG SAUER

Manufacturer Part Number

RM400-556N-16B-FORGE-CON

Reviews (0)

Reviews

There are no reviews yet.

Be the first to review “Sig Sauer M400 Forge Concrete Gray Rifle 5.56 NATO 30rd Magazine 16″ Barrel ROMEO-MSR GEN II Adjustable Stock M-LOK Handguard” Cancel reply

Your email address will not be published. Required fields are marked *

Shipping & Delivery

Related products

Sold out
Compare

AMERICAN TACTICAL INC GSG-16 CARB 22LR MINT 22+1 16″

Semi Auto Rifles
$367.00
AMERICAN TACTICAL INC GSG-16 CARB 22LR MINT 22+1 16"
Add to wishlist
Purchase & earn 367 points!Read more
Quick view
Compare

ROSSI RS22 22LR BRZ/BRZ 18″ 10+1

Semi Auto Rifles
$186.00
ROSSI RS22 22LR BRZ/BRZ 18" 10+1
Add to wishlist
Purchase & earn 186 points!Add to cart
Quick view
Sold out
Compare

ROSSI RS22 22MAG BLK/GRAY 21″ 10+1

Semi Auto Rifles
$281.00
ROSSI RS22 22MAG BLK/GRAY 21" 10+1
Add to wishlist
Purchase & earn 281 points!Read more
Quick view
Sold out
Compare

ROSSI RS22 22MAG BLK/TAN 21″ 10+1

Semi Auto Rifles
$281.00
ROSSI RS22 22MAG BLK/TAN 21" 10+1
Add to wishlist
Purchase & earn 281 points!Read more
Quick view
Sold out
Compare

SAVAGE ARMS 64 FV-SR SEMI-AUTO 22LR BL/SY

Semi Auto Rifles
$181.00
SAVAGE ARMS 64 FV-SR SEMI-AUTO 22LR BL/SY
Add to wishlist
Purchase & earn 181 points!Read more
Quick view
Compare

SAVAGE ARMS 64 SEMI-AUTO 22LR BLUE 10+1

Semi Auto Rifles
$150.00
SAVAGE ARMS 64 SEMI-AUTO 22LR BLUE 10+1
Add to wishlist
Purchase & earn 150 points!Add to cart
Quick view
Compare

SAVAGE ARMS 64 XP SEMI-AUTO 22LR BL/SYN LH

Semi Auto Rifles
$198.00
SAVAGE ARMS 64 XP SEMI-AUTO 22LR BL/SYN LH
Add to wishlist
Purchase & earn 198 points!Add to cart
Quick view
Compare

SAVAGE ARMS A22 22LR BL/SYN 16.5″ 10+1 TB

Semi Auto Rifles
$364.00
SAVAGE ARMS A22 22LR BL/SYN 16.5" 10+1 TB
Add to wishlist
Purchase & earn 364 points!Add to cart
Quick view

    At Great Lakes Firearms of Porter, Indiana, our mission is to provide our customers with the finest firearms and ammunition available, while promoting responsible gun ownership and safety.

    Quick Links

    • About
    • Service
    • Shop
    • Blog
    • Contact

    Useful Link

    • Privacy Policy
    • Term Of Use
    • Returns Policy
    • Reviews

    Great Lakes Firearms

    • (219) 617-6679
    • 1355 Dune Meadows Dr,
      Porter, Indiana 46304

    Newsletter

    Copyright 2025, Great Lakes Firearms | All Rights Reserved.

    Shopping cart
    Close
    Start typing to see products you are looking for.
    Shop
    Wishlist
    0 items Cart
    My account