Used Sig Sauer M400 TREAD Predator 5.56 NATO AR-15 AR15 16" M 400 THREADED

Sig Sauer M400 556 M 400 AR 15 AR15

Sold On:September 27, 2026 at 9:45 PM
How Buying WorksEnded on September 27, 2026 at 9:45 PM

Key Features

  • Item Type: Semi Auto Rifles
  • Action: AR-15 Direct Impingement
  • Manufacturer: Sig Sauer
  • Capacity: 30 1
  • Model: M400
  • Barrel Length: 16"
  • Caliber: 5.56mm NATO
  • Finish: Cerakote Elite Jungle
  • Overall Condition: Very Good

Product Description

    Sig Sauer M400 TREAD Predator 5.56mm NATO Semi-Auto AR-15, 16-inch Stainless Threaded Barrel, Cerakote Elite Jungle

    The M400 TREAD Predator stands out with a stainless 16-inch threaded barrel capped by a smooth thread protector, a 15-inch M-LOK free-float Predator/TREAD handguard, and a flat-top upper with a Picatinny rail. The handguard is a slick-top design without a top rail, so there is not a continuous full-length top Picatinny rail. Finished in Cerakote Elite Jungle with black furniture, this USA-made AR-15 platform rifle is part of SIG's TREAD ecosystem and ships with a 30-round magazine.

    Condition

    Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.

    Bore Condition: Excellent - Clean, mirror finish, no signs of wear.

    Bore Rifling: Excellent Rifling - Sharp lands and grooves.

    Specific Condition Details: The exterior shows a few light, superficial scratches and small blemishes consistent with careful handling.

    What's Included
    • Sig Sauer M400 TREAD Predator rifle (5.56mm NATO)
    • 1x 30-round STANAG-pattern polymer magazine (detachable); visually confirmed in photos

    This TREAD Predator variant pairs the M400 direct-impingement system with a stainless 16-inch barrel for durability and consistent performance. The barrel is threaded and includes a smooth thread protector for ready use with compatible muzzle devices.

    A 15-inch M-LOK free-float Predator/TREAD aluminum handguard provides extended mounting real estate while keeping the barrel free-floated. The flat-top upper receiver carries a Picatinny rail for straightforward mounting of sights or optics; the handguard lacks a top rail, so there is not a continuous full-length top rail.

    The rifle features a Cerakote Elite Jungle finish on the receivers and handguard, contrasted by black furniture for a clean two-tone presentation. The aluminum receiver set and handguard keep weight in check while offering strength for regular use.

    Ergonomics include a black polymer stock with a QD sling socket and a SIG-branded textured polymer pistol grip. The rifle is chambered in 5.56mm NATO with a 30+1 capacity and is configured without factory sights, allowing the user to choose their preferred sighting system.

Specifications

Item TypeSemi Auto Rifles
ManufacturerSig Sauer
ModelM400
SubmodelTREAD Predator
Caliber5.56mm NATO
Overall ConditionVery Good
Bore ConditionExcellent
ActionAR-15 Direct Impingement
Capacity30 1
Barrel Length16"
FinishCerakote Elite Jungle
Stock/GripsSIG-branded textured polymer pistol grip
Sight/Opticnone
Country of OriginUnited States