SIG SAUER SIG SAUER SIGM400

Seller Description For This Firearm

RIFLE: SIG SAUER MODEL SIG SAUER SIGM400, SERIAL NUMBER 20L183079, BLACK (MATTE), SEMI - AUTOMATIC, 5.56MM, NA

Notes:
The SIG Sauer SIGM400 5.56 NATO Rifle is a semi-automatic, AR-15–style rifle manufactured by SIG Sauer. Introduced in 2011, it’s designed for civilian, law enforcement, and sporting use, offering a balance of performance, reliability, and modularity.

Key Features

• Caliber:
Most commonly 5.56×45mm NATO / .223 Remington, with some variants chambered in .300 AAC Blackout

• Action:

Gas-operated, direct impingement system
Rotating bolt, firing from a closed bolt
Based on the traditional AR-15 operating system

• Capacity:

Uses standard AR-15/STANAG detachable magazines (typically 20- or 30-round)

• Barrel Lengths:

Commonly 16 inches, with other options ranging from about 14.5" to 20" depending on variant

• Construction:

Aircraft-grade aluminum receivers
Free-float handguards (on newer models like the Tread)
Steel barrel, often stainless or chrome-lined

• Stock & Ergonomics:

Adjustable/telescoping stock
Standard AR-style controls (safety, magazine release, charging handle)
Compatible with a wide range of aftermarket parts
Variants

The SIGM400 is actually a family of rifles, including:

M400 Tread – entry-level, modular rifle
M400 Elite / PRO – upgraded features (better trigger, barrel)
M400 Predator – hunting-focused configuration
M400 SDI / specialty models – enhanced ambidextrous controls and components
Performance & Use
Accurate and consistent, especially with quality ammo
Moderate recoil, typical of 5.56 rifles
Known for reliability and solid build quality
Common uses:
Target shooting and range use
Hunting (varmint, predator, some deer with proper ammo)
Home defense or general-purpose rifle
Specifications (Typical)
Weight: ~7–7.6 lbs
Operation: Semi-automatic
Platform: AR-15 pattern
Gas system: Direct impingement

UPC	ECOM00537147
Action	SEMI AUTOMATIC
Barrel Length	NA
Caliber	5.56X45MM NATO
Capacity	NA
Finish	BLACK (MATTE)