Sig Sauer M400 Tread 5.56mm Semi-Automatic Rifle

  • Item Number: RM400-16B-TRD
  • /
  • View More Items by Sig Sauer
  • /
  • Condition: NEW
$849.99 $949.99

In Stock with FREE shipping
  • SMITH AND WESSON MP15 SPORT II 5.56MM OR WITH M-LOK

    Smith & Wesson MP15 Sport II 5.56mm Optics Ready Semi-Auto Rifle with M-LOK Handguard
    $792.00 $599.99

  • SMITH AND WESSON MP15 SPORT II 5.56MM OR M-LOK TRUGLO

    Smith & Wesson MP15 Sport II 5.56mm Semi-Automatic M-LOK Rifle with TruGlo Red Dot
    $619.99

  • SMITH AND WESSON MP15 SPORT II 5.56MM OR WITH M-LOK AND VORTEX SPARC

    Smith & Wesson MP15 Sport II 5.56mm Semi-Automatic M-LOK Rifle with Vortex SPARC II AR Red Dot
    $699.99

  • RADICAL FIREARMS RF-15 SOCOM 5.56MM AR-15 RIFLE WITH 15-INCH RPR FREE-FLOAT RAIL

    Radical Firearms RF-15 Socom 5.56mm AR-15 Rifle with 15-Inch RPR Free-Float Rail
    $449.99

  • SMITH AND WESSON MP15 SPORT II 5.56 RIFLE

    Smith & Wesson MP15 Sport II 5.56mm Rifle with Dust Cover and Forward Assist
    $812.00 $719.99

  • SMITH AND WESSON MP15 SPORT II 5.56 OPTIC READY PACKAGE

    Smith & Wesson MP15 Sport II 5.56mm Optics Ready Rifle with Caldwell Mag Charger and Duty Serie
    $843.98 $649.99

  • DANIEL DEFENSE DDM4 M4A1 5.56 NATO 14.5 IN BBL FDE FLASHIDER PERMANENTLY ATTACHED

    Daniel Defense M4A1 5.56 NATO AR-15 with MilSpec + Finish
    $2,315.00

  • ALEX PRO FIREARMS AR-15 BLACK 300 BLKOUT 15 IN MLOK HG 30 RD MAG

    Alex Pro Firearms Econo 300 Blackout Optic Ready Slim Carbine with 16 Inch Barrel
    $709.95 $499.99

  • RADICAL FIREARMS RADICAL FIREARMS RF-15 5.56MM SOCOM WITH 15-INCH MHR RAIL

    Radical Firearms RF-15 Socom 5.56mm AR-15 Rifle with 15-Inch MHR Free Float Rail
    $449.99

  • RUGER AR-556 MPR 5.56MM FRAZZLED BROWN CERAKOTE

    Ruger AR-556 MPR 5.56mm Semi-Auto Rifle with Frazzled Brown Cerakote Finish
    $958.00 $899.99

  • RUGER AR-556 MPR 450 BUSHMASTER

    Ruger AR-556 MPR 450 Bushmaster Semi-Automatic Multi-Purpose Rifle
    $1,269.00 $999.99

  • SPRINGFIELD SAINT 556 M-LOK AR15 B5 FURNITURE

    Springfield Saint 5.56 NATO AR-15 Rifle with B5 Furniture
    $959.99

  • PMC X-TAC 5.56mm NATO 62 gr M855 Green-Tip 20/Box

    PMC X-TAC 5.56mm NATO 62 gr M855 Green-Tip 20/Box
    $9.99
    ($0.50 / round)

  • Winchester 223 Rem 55 gr FMJ 20/Box

    Winchester 223 Rem 55 gr FMJ 20/Box
    $10.49
    ($0.52 / round)

  • Hornady 223 Rem 68 gr BTHP Match Frontier 20/Box

    Hornady 223 Rem 68 gr BTHP Match Frontier 20/Box
    $11.79
    ($0.59 / round)

  • Hornady 5.56mm NATO 62 gr FMJ Black 20/Box

    Hornady 5.56mm NATO 62 gr FMJ Black 20/Box
    $18.80 $13.49
    ($0.67 / round)

  • Federal 5.56mm 55 gr FMJ BT American Eagle 100/Box

    Federal 5.56mm 55 gr FMJ BT American Eagle 100/Box
    $49.99
    ($0.50 / round)

  • Hornady 223 Rem 55 gr V-MAX Varmint Express 20/Box

    Hornady 223 Rem 55 gr V-MAX Varmint Express 20/Box
    $27.24 $19.99
    ($1.00 / round)

  • Federal 223 Rem 53 gr Hornady V-Max Varmint and Predator 20/Box

    Federal 223 Rem 53 gr Hornady V-Max Varmint and Predator 20/Box
    $18.99
    ($0.95 / round)

  • Winchester 5.56mm M855 Green Tip 62 gr FMJ Stripper Clip 420 Rounds in Metal Ammo Can

    Winchester 5.56mm M855 Green Tip 62 gr FMJ Stripper Clip 420 Rounds in Metal Ammo Can
    $279.99
    ($0.67 / round)

  • Norma 223 Rem 55 Gr FMJ 30/Box

    Norma 223 Rem 55 Gr FMJ 30/Box
    $14.99
    ($0.50 / round)

  • Federal 223 Rem 55 gr FMJ BT American Eagle 20/Box

    Federal 223 Rem 55 gr FMJ BT American Eagle 20/Box
    $11.49
    ($0.57 / round)

  • Winchester 5.56mm M193 55 gr FMJ Stripper Clip 420 Rounds in Metal Ammo Can

    Winchester 5.56mm M193 55 gr FMJ Stripper Clip 420 Rounds in Metal Ammo Can
    $263.99
    ($0.63 / round)

  • Hornady 5.56 NATO 75 gr BTHP Match Frontier 20/Box

    Hornady 5.56 NATO 75 gr BTHP Match Frontier 20/Box
    $21.99
    ($1.10 / round)

  • MAGPUL PMAG 30 GEN M2 AR-15 556 NATO 30 RD MAG

    Magpul PMAG GEN M2 5.56mm 30-Round Black Magazine
    $12.95 $8.99

  • MAGPUL PMAG 10 GEN M3 AR-15 556 NATO 10 RD MAG

    Magpul PMAG GEN M3 5.56mm 10-Round AR-15 Magazine
    $14.99

  • MAGPUL PMAG 30 GEN M3 AR-15 556 NATO 30 RD MAG

    Magpul PMAG GEN M3 5.56mm 30-Round Black Magazine
    $16.99

  • AMEND2 MOD 2 AR-15 5.56 MM 20 RD BLACK MAG

    Amend2 AR15/M4 Mod.2 5.56mm/223 Rem. 20-Round Magazine (Black)
    $14.99 $9.99

  • MAGPUL PMAG 30 GEN M3 AR-15 556 NATO 30 RD WINDOW MAG

    Magpul PMAG GEN M3 5.56mm 30-Round Black Magazine with Window
    $17.99

  • MAGPUL PMAG 30 GEN M3 AR-15 556 NATO 30 RD WINDOW MAG (TAN)

    Magpul PMAG GEN M3 5.56mm 30-Round Coyote Tan AR/M4 Magazine with Window
    $19.99

  • AMEND2 MOD 2 AR-15 5.56 MM 30 RD BLACK MAG

    Amend2 AR15/M4 Mod.2 5.56mm/223 Rem. 30-Round Magazine (Black)
    $14.99 $11.99

  • MAGPUL PMAG 20 GEN M3 AR-15 556 NATO 20 RD MAG

    Magpul PMAG GEN M3 5.56mm 20-Round Black Magazine
    $13.99

  • MAGPUL PMAG 30 GEN M2 AR-15 556 NATO 30 RD WINDOW MAG

    Magpul PMAG GEN M2 5.56mm 30-Round Magazine with Window
    $19.99

  • MAGPUL PMAG 40 GEN M3 AR-15 556 NATO 40 RD MAG

    Magpul PMAG 40 AR/M4 GEN M3 5.56mm 40-Round Magazine
    $21.99

  • MAGPUL PMAG 30 GEN M3 AR-15 556 NATO 30 RD MAG (TAN)

    Magpul PMAG GEN M3 5.56mm 30-Round Coyote Tan Magazine
    $16.99

  • AMEND2 MOD 2 AR-15 556 30 RD FDE MAG

    Amend2 AR15/M4 Mod.2 5.56mm/223 Rem. 30-Round Magazine (Flat Dark Earth/FDE)
    $14.99 $8.99

Product Description

What's in the Box

  • Sig Sauer M400 Tread 5.56mm Semi-Automatic Rifle
  • (1) Magazine
  • Cable Lock
  • Owner's Manual

The M400 TREAD from Sig Sauer is a premium entry-level rifle, accompanied by a full-line of TREAD branded accessories that gives the consumer the freedom to grow. This premium rifle, at a moderate price point, is packed with innovation and flexibility, and doesn't sacrifice the quality demand from Sig.

This base model is loaded with features which would be considered costly upgrades on comparable models. Right out of the box, the TREAD features a factory-installed, aluminum, free-floating M-LOK handguard for improved accuracy, and can be easily removed with two hex screws to change out to the TREAD accessory option.

Want to mount an optic? No problem! The TREAD is an optics ready, aluminum frame rifle. Other features include a single-stage polished/hard-coat trigger, ambidextrous controls, a Magpul™ SL-K 6 position telescoping stock, and a mid-length gas system. This rifle, combined with the accessories, both premium SIG SAUER products offered at a budget-friendly price, will set a new standard for the industry, and Sig's entire TREAD brand can best be defined as the new face of freedom.

Firearm Specifications

  • Manufacturer: Sig Sauer
  • Model: M400 TREAD
  • Caliber: 5.56mm NATO
  • Barrel Length: 16"
  • Overall Length: 30.8"
  • Overall Width: 2.5"
  • Height: 7.5"
  • Twist Rate: 1:8"
  • Stock Type: 6-Position SLK-K
  • Barrel Material: Carbon Steel
  • Trigger Type: Single Stage; Polished/Hard-Coat
  • Receiver FInish: Hard Coat Anodized
  • Threads: 1/2"-28 TPI
  • Accessory Rail: M-LOK
  • Operating System: Direct Impingemen

Customer Comments & Questions

Customer Reviews

(4 out of 5) Sig Sauer M400 / 556
by from Norfolk, VA on

Just picked up this AR15 from my gun dealer. If this is considered an entry level I wonder what Sig’s $2000 ARs are like to shoot. I did have my dealer install a completion trigger, which is amazing. Feels like you cd blow on it and it would fire and a EOTECH red dot. Yes, that’s another $500 but totally worth it. The rifle is absolutely incredible. I’ve been a handgun guy for several years and this is my first AR. I cannot lay enough accolades on this Sig firearm. The two modifications I made make it absolutely unbeatable and I dare say it will shoot just as good as the more expensive models. Was sighted at 110 yds and my first shots ever were all in the bullseye zone. A fantastic experience!