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Sig Sauer Tread Coil M400 AR-15 5.56 NATO Rifle - 16"

AR-15 Rifle

In stock
Only 1 left

Available for In-Store Purchase Auburn, WA

FFL Required Before Shipping.
Please have your dealer email a copy of their FFL to [email protected] or fax it to 253-218-2998, referencing your name and order number.


The TREAD COIL sets a new standard in performance and value in the AR category. With installed accessories including ROMEO5 Red Dot Sight, 2 Stage Match Trigger, and 13” lightweight handguard, the COIL is the perfect rifle package for the avid user or first-time buyer. Other features of the TREAD COIL include the precision 16” stainless barrel, ambidextrous controls, and 6-position Magpul SL Stock.



  • Barrel Length: 16 in (406.4 mm)
  • Magazine Included: (1) 30rd Polymer Mag
  • Mag Type: AR-15
  • Action Type: Semi-Auto
  • Barrel material: Stainless Steel
  • Twist Rate: 1:8
  • Forend Type: Alloy
  • Grip Type: Polymer
  • Receiver Finish: Hard Coat Anodized
  • Overall length: 30.8 in [782 mm]
  • Overall Width: 2.5 in [64 mm]
  • Height: 7.5 in [191 mm]
  • Threads: 1/2 in - 28 tpi
  • Accessory Rail: M-LOK
  • Operating System: Direct Impingement
  • Weight: 7 lbs [3.2 kg]
More Information
Product Type AR-15 Rifle
Manufacturer Sig Sauer
Thread Pitch 1/2x28
Color Black
Profile Non-fluted
Barrel Length 16"
Caliber 5.56 NATO