Sig Sauer M400 Tread 5.56 NATO 16" 30 rd RM400-16B-TRD-COIL

Out of Stock


The Sig Sauer M400 Tread Coil is a precise, reliable, and consistent modern sporting rifle that comes loaded with options. Features include a Romeo4 red dot, a Tread vertical foregrip, a Matchlite Duo trigger, a free-float M-LOK handguard, an adjustable stock, and a 30 round magazine.


The Tread Coil features a ROMEO5 optic with a 2MOA dot with ten illumination settings, MOTAC and a 50k battery life; free-float M-LOK 13" TREAD handguard, a TREAD Matchlite Duo trigger, TREAD vertical foregrip, 6-position Magpul SL-K telescoping stock, 3-prong flash hider and ambidextrous controls.


  • Caliber: 223 Rem
  • Model: M400
  • Series: Tread Coil
  • Stock Finish: Black
  • Action: Semi-Auto
  • Barrel Length Range: 16" to 16.99"
  • Sights: None, Optic Ready
  • Scope: Romeo5 Red Dot
  • Capacity: 30+1
  • Muzzle: 3 Prong Flash Hider
  • Hand: Ambidextrous
  • Handguards: 13" M-LOK Free Float
  • OAL: 30.80"
  • Receiver Finish: Black Hard Coat Anodized
  • Receiver Material: Aluminum
  • Stock Description: Magpul SL-K Telescoping
  • Stock Finish Group: Black
  • Stock Material: Synthetic
  • Trigger: Sig Matchlight
  • Twist: 1:8"
  • Weight: 7 lbs
  • Barrel Finish: Brushed Stainless Steel
  • Barrel Length: 16"


MODEL M400 Tread Coil
TYPE Modern Sporting Rifles
UPC 798681632381
Categories: Semi Auto Rifles
Condition: New
Manufacturer: SIG SAUER
Model: M400 Tread
SKU: 798681632381
UPC: 798681632381
Vendor: Gunprime
Reviews (8)
By Jwebbs3162 on 11/10/22
Overall good experience

I purchased a Sig Sauer m400, haven’t been able to test the rifle. What I will tell you is, Gunprime had sent the wrong rifle but did a great job of handling the mix up. My new rifle was there a week later. Bought some ammo as well painless and there within a few days.

By Cory C. on 12/31/21
Worth It!

Gunprime has been absolutely nothing but great help! Gun ended up being shipped with out the 30rd mag. Accidents or whatever happen and with no questions asked or any problems they instantly sent me one. Now that's great customer service and have definitely earned my business forever.
The AR it's self is awesome and is really everything you need for beginners or just an all around fun gun. Thank you Gunprime again for your awesome service. Shipped to north Texas in 3 days with great packaging!

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By Neal Vinsant on 08/12/21
Excellent service order completed in timely manner

I would buy again

By Preacher Man on 03/29/21
Sig M400

The Sig Sauer M400 Tres Coil is truly a beautiful rifle, just what I expected it to be. I thank Gun Prime for the fast shipping and careful packing of my rifle. I can’t wait to get to the range to take my new Sig M400 Tread Coil through its paces.

By Tlove on 03/16/21
Prompt shipping, good price, arrived early

Name brand, quality product at a good price ready to take to the range. Would definitely buy again.

By Jeff on 03/10/21
Great transaction.

very easy to make the purchase. I definitely will be using the site again.

User uploaded images:

By Jeff on 03/10/21
Great transaction.

very easy to make the purchase. I definitely will be using the site again.

User uploaded images:

By Kevin on 03/02/21
Awesome and easy

It’s a great gun and came ready to use with most of the upgrades you would want.

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