Product Details

The long awaited SIG Sauer M400 Tread is an AR-15 unlike any other.

First this rifle begins it's life as a set of forged aluminum upper/lower receivers which feature a hard coat anodized finish.

Next the Tread comes standard with a 16" stainless steel barrel which provides incredible shot to shot consistency and tight groupings.

Next a free floating M-LOK compatible hard guard will help ensure you maintain accuracy while providing tons of modular M-LOK rail compatible spaces.

The ambidextrous controls and charging handle will ensure either a righty or southpaw lefty shooter will be able to manipulate the rifle.


  • SIG Sauer M400 Tread AR-15 Semi Auto Rifle RM400-16B-TRD
  • Direct Gas Impingement System (Mid-Length)
  • 5.56 NATO (Accepts .223 Remington)
  • 16" Stainless Steel Barrel (Matte Bead Blasted Finish)
  • 1:8" Twist Rate
  • Barrel Threaded 1/2"x28
  • 3 Chamber Compensator
  • Forged Aluminum Upper/Lower Receivers
  • Ambidextrous Controls
  • Free Float M-LOK Compatible Hand Guard
  • Single Stage Polished Hard Coat Trigger
  • Magpul SL-K 6 Position Telescoping Stock
  • SIG Sauer Pistol Grip
  • Ambidextrous Charging Handle
  • 30 Round Standard Pattern AR-15 Magazine (Polymer)
  • Overall Length 30.8"
  • Overall Height 7.5"
  • Overall Weight 7lbs


More Information

More Information
Caliber 223/5.56
Manufacturer SKU RM40016BTRD
UPC 798681597765
Condition New
Suggested Use Self Defense, Duty / LE / Tactical
Model M400
Caliber 223 Rem/5.56 NATO
Capacity 30
Barrel Description Stainless Steel Free-Floating
Color Black
Manufacturer Sig Sauer
Metal Finish Black Hardcoat Anodized/Stainless Steel
Metal Finish Group Blued/Black
OAL 30.8"
Receiver Material 7075 T6 Aluminum
Stock Description 6-Position Adjustable Magpul SL-K
Stock Finish Group Black
Trigger Single-Stage
Twist 1:8"
Restrictions State restrictions do not allow shipping of this product to WA

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