Sig Sauer SIGM400 TREAD 5.56mm NATO AR-15 Semi-Auto Rifle with 16" Threaded Barrel, Free-Float M-LOK Handguard, and 3 Magpul PMAGs
This Sig Sauer SIGM400 TREAD is a U.S.-made AR-15 platform rifle chambered in 5.56mm NATO with a 16" threaded barrel and a flash hider. It features a free-float M-LOK handguard, a full-length Picatinny top rail with T-index markings, and a collapsible polymer stock. This example also includes a small engraved U.S. flag graphic on the handguard.
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: The rifle shows mild scuffs and visible signs of use.
What's Included
- 3x Magpul PMAG 30-round magazines (polymer), marked "5.56x45"
- SIG SAUER manual/booklet labeled "SIG M400 TREAD / SIG M400 PRO"
The SIGM400 TREAD uses a direct impingement action and is set up with a free-float M-LOK handguard and top Picatinny rail, providing a clean, functional layout for mounting compatible accessories. The top rail includes T-index markings for consistent placement.
At the muzzle, the 16" barrel is threaded and fitted with a flash hider. The muzzle device appears to be a 3-prong flash-hider style unit.
Furniture includes a collapsible polymer stock with a 13.5 length of pull and a SIG SAUER-branded polymer pistol grip. The rifle is finished in a matte dark color.
Receiver markings include "SIG SAUER SIGM400" on the upper receiver and "SIG SAUER INC / NEWINGTON / NH, USA" on the lower receiver.