Sig Sauer M400 TREAD 5.56 NATO AR-15, 16 inch Stainless Barrel, Mid-Length Gas, 1/2x28 Threaded, Free-Float M-LOK Handguard
The Sig Sauer M400 TREAD stands out with a 16-inch stainless barrel, mid-length gas system, and a free-float aluminum M-LOK TREAD handguard with a laser-engraved TREAD graphic. It features a 1:8 twist for 5.56 NATO, 1/2x28 threads with a three-prong flash hider, and a flat-top upper with a Picatinny rail, forward assist, and ejection-port cover. This example includes a SIG short vertical foregrip and a 30-round Magpul PMAG.
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 Notes: Shows minimal signs of use.
What's Included
- Sig Sauer M400 TREAD 5.56 NATO rifle
- 1 Magpul PMAG 30-round polymer AR-15 magazine
- SIG SAUER short vertical foregrip (installed)
This M400 TREAD configuration pairs a 16-inch stainless steel barrel with a mid-length gas system for balanced handling. The barrel is marked "5.56 NATO," uses a 1:8 twist, and is threaded 1/2x28 with a factory three-prong flash hider.
The free-float aluminum M-LOK TREAD handguard includes a laser-engraved TREAD graphic, providing a rigid, lightweight mounting platform. The flat-top upper adds a full-length Picatinny rail and incorporates a forward assist and ejection-port cover. The upper forging mark is "A."
The rifle uses a direct-impingement, semi-automatic action on an aluminum receiver with a hard-coat anodized finish. The magwell wears the SIG SAUER logo, and the capacity is 30+1 with the included PMAG.
A 6-position collapsible polymer stock sets the length of pull at 13.75 inches. This rifle comes with a factory SIG short vertical foregrip installed to complement the handguard setup.