FREE Ground Shipping on orders $149+ Use Coupon Code: EPSHIP4FREE (Some exlusions apply)

Filters

SIG SAUER M400 FORGE 5.56 RIFLE 16.5″ BBL, BLACK, ROMEO MSR G2, TELESTOCK 1-30RD MAG

$999.99

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.

UPC

798681744114

Manufacturer

Manufacturer Part Number

RM400-556N-16B-FORGE

Action

Semi-Auto

Barrel Finish

Black

Barrel Length

16″

Caliber/Gauge

.223 REM/5.56 NATO

Capacity

30

Magazine Included

1 x 30-Round

Model

M400

Number of Magazines

1 30 rd.

Product Type

AR

Rate of Twist

1:7″

Shipping Weight

9.4

Sights

Optics Ready

Top Rate Customer ServicePrompt Communication
Safe Payments
Trusted SSL Protection
Amazing Selection
We carry all top brands

Related Products

SIG SAUER M400 FORGE 5.56 RIFLE 16.5″ BBL, BLACK, ROMEO

Not yet rated

(0)

SIG SAUER M400 FORGE 5.56 RIFLE 16.5″ BBL, BLACK, ROMEO MSR G2, TELESTOCK 1-30RD MAG

$999.99

Out of stock

Disclaimer: It is the customer’s responsibility to ensure that all orders comply with applicable local and federal regulations. Non-compliant orders are subject to a 30% restocking fee. We reserve the right to dispute any chargebacks related to such orders.

Guidelines for Shipping Restrictions by State

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.

UPC

798681744114

Manufacturer

Manufacturer Part Number

RM400-556N-16B-FORGE

Action

Semi-Auto

Barrel Finish

Black

Barrel Length

16″

Caliber/Gauge

.223 REM/5.56 NATO

Capacity

30

Magazine Included

1 x 30-Round

Model

M400

Number of Magazines

1 30 rd.

Product Type

AR

Rate of Twist

1:7″

Shipping Weight

9.4

Sights

Optics Ready

Welcome to Extreme Products, in order to browse our site you must be at least 18 years of age.
Are you at least 18 years old?
No