Sig Sauer M400 TREAD 5.56 NATO AR-15, 16 in Stainless Barrel, Mid-Length Gas, Free-Float M-LOK, 1/2x28, 1:8 Twist, Includes 3 Magazines
The Sig Sauer M400 TREAD is a feature-rich AR-15 pattern rifle with a 16 in stainless steel barrel, a mid-length gas system, and a free-float aluminum M-LOK handguard. This example includes a factory three-prong flash hider, a flat-top upper with a T-marked Picatinny rail, and a Magpul MOE SL-K telescoping stock. It is in excellent condition and comes with three 30-round Magpul PMAG GEN M2 MOE magazines.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are minimal markings from previous handling or use. Please refer to the pictures for a complete view.
What’s Included
- Sig Sauer M400 TREAD 5.56mm NATO rifle
- Three 30-round Magpul PMAG GEN M2 MOE polymer magazines
The M400 TREAD runs a semi-automatic, direct impingement system with a mid-length gas setup. Its AR-15 platform configuration provides compatibility with common accessories and magazines in this class.
The 16 in stainless steel barrel features a 1:8 twist and 1/2x28 threads capped with a factory three-prong flash hider. This configuration supports a wide range of 5.56 NATO and .223 bullet weights while maintaining durability and corrosion resistance.
The free-float aluminum M-LOK handguard with the TREAD branding band offers ample mounting surfaces. A flat-top upper with a T-marked Picatinny rail is ready for mounting sights or other accessories as desired.
Furniture includes a Magpul MOE SL-K telescoping stock and a polymer pistol grip, with a listed length of pull of 10.5 in. The receivers are aluminum with a hard-coat anodized finish for wear resistance.
Markings include SIGM400 and SIG SAUER INC NEWINGTON NH USA on the receiver. Overall length is approximately 30.8 in, weight is about 7.0 lb, and capacity is 30+1. This rifle is made in the USA.