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SIG SAUER SIG SAUER SIGM400 5.56X45MM NATO
Guns International #: 103547806 Seller's Inventory #: 641455
Category: Sig Sauer Rifles - AR15 Rifles
Seller's Information
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Seller: Guns Dot Com
Member Since: 9/8/21
State: Minnesota
Zip: 55337
Country: United States
Platinum Seller
Number of Active Listings: 43093
Total Number of Listings: 486515
Seller: FFL Dealer
Return Policy: 3 day inspection and return policy on used guns.
CERTIFIED USED GUNS Guns Certified Used Guns may be returned within 3 days after the transfer is complete for any reason for a full refund, minus any fees, shipping costs and a 15% restocking fee. A Guns Certified Used Gun may also be returned within 7 days if it is malfunctioning with proper use. NON-CERTIFIED USED GUNS Non-certified used guns can be returned if there is a mechanical defect that occurs within 3 calendar days of the physical transfer of the firearm to your possession. All other reasons for returns on non-certified used guns are ineligible.
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Description:
Guns Listing ID: 641455
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
SOLD
Manufacturer: SIG SAUER
Model: SIG SAUER SIGM400
Caliber Info: 5.56X45MM NATO
Condition: Used - Non-Certified
Barrels: NA
Action: SEMI AUTOMATIC
Finish: Black (Matte)