Sig Sauer M400 Classic 5.56mm Rifle

  • Item Number: RM400-16B-C
  • /
  • View More Items by Sig Sauer
  • /
  • Condition: NEW
$1,249.99

Temporarily Out of Stock

Includes FREE shipping
  • SPRINGFIELD SAINT 5.56MM EDGE

    Springfield Saint Edge 5.56mm Semi-Automatic AR-15
    $1,350.00 $1,219.99

  • DANIEL DEFENSE DDM4 V7 5.56MM SEMI-AUTOMATIC RIFLE

    Daniel Defense DDM4 V7 5.56mm Semi-Automatic Rifle
    $1,870.00

  • DANIEL DEFENSE DDM4 V7 5.56MM SEMI-AUTO RIFLE

    Daniel Defense DDM4 V7 5.56mm Semi-Auto Rifle with Mil-Spec + Cerakote Finish
    $2,057.00

  • DANIEL DEFENSE DDM4V7 PRO 5.56MM SEMI-AUTOMATIC RIFLE

    Daniel Defense DDM4V7 Pro Series 5.56mm Semi-Automatic Rifle
    $2,162.00

  • DANIEL DEFENSE DD M4A1 5.56MM SEMI-AUTOMATIC RIFLE

    Daniel Defense DD M4A1 5.56mm Semi-Automatic Rifle
    $2,128.00

  • DANIEL DEFENSE DDM4 V9 223/5.56MM SEMI-AUTOMATIC RIFLE

    Daniel Defense DDM4 V9 223/5.56mm Semi-Automatic Rifle
    $1,979.99

  • 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)

  • 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)

  • 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)

  • Winchester 5.56mm NATO 62 gr FMJ M855 Green Tip Lake City 20/Box

    Winchester 5.56mm NATO 62 gr FMJ M855 Green Tip Lake City 20/Box
    $10.99
    ($0.55 / round)

  • Hornady 223 Rem 62 gr FMJ Black 20/Box

    Hornady 223 Rem 62 gr FMJ Black 20/Box
    $17.11 $12.79
    ($0.64 / round)

  • Winchester 5.56mm M193 55gr FMJ USA Valor Series 125/Box

    Winchester 5.56mm M193 55gr FMJ USA Valor Series 125/Box
    $69.99
    ($0.56 / 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)

  • Federal 5.56mm 55 gr FMJ 20/Box

    Federal 5.56mm 55 gr FMJ 20/Box
    $12.99
    ($0.65 / 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)

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

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

  • 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 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 WINDOW MAG

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

  • 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

  • MAGPUL PMAG D-60 AR-15 556 NATO 60 RD DRUM

    Magpul PMAG D-60 5.56x45 NATO 60-Round Drum Magazine
    $129.99 $119.99

Product Description

Designed for use in law enforcement, military operations, or the sporting field as well as competitive shooting. The SIGM400 is a true AR platform tactical rifle. Provides unparalleled accuracy, with a 16” chrome-lined and phosphate coated barrel that provides maximum durability and corrosion resistance. A 7075-T6 aircraft grade aluminum forged lower receiver adds to the durability and reliability.

    • Direct impingement gas operating system with rotating locking bolt
    • 5.56 x 45 mm NATO Chrome-lined barrels with phosphate finish
    • Accepts most M16 type magazines
    • A2 Type flash supressor
    • ”F” marked fixed front sight

Firearm Specifications

  • Caliber: 5.56 X 45mm NATO
  • Barrel Length: 16”
  • Action: Semi-Auto
  • Trigger Type: MIL-STD
  • Trigger Weight: 7.6 lbs
  • Overall Length: 39.5”
  • Magazine Capacity: 30 Rounds

Customer Comments & Questions

Customer Reviews

(5 out of 5) Awesome zombie killer
by from Port Hueneme, California on

Great gun. No problems. It's a Sig