The SIG Sauer M400 Tread (SIG Sauer part no. RM400-16B-TRD-V2) is a 5.56 NATO AR-15 built with a stainless steel barrel and an upgraded Matchlite two-stage trigger for shooters who want SIG’s reputation for quality in a modern sporting rifle. SIG Sauer runs a mid-length gas system for smooth cycling and reduced recoil, and fits the rifle with a free-floating M-Lok handguard for easy accessory mounting. A Magpul telescoping stock and an ambidextrous safety round out a rifle built for home defense, range use, or duty-style applications.

Key Specifications

• Chambered in .223 Remington/5.56 NATO.
• Barrel length is 16 inches, in stainless steel.
• Rate of twist is 1:8 inches.
• The receiver wears an anodized finish.
• The gas system is mid-length for smooth cycling.
• The trigger is a SIG Matchlite two-stage trigger.
• The stock is a Magpul telescoping stock.
• The safety selector is ambidextrous.
• The upper ships optics-ready, with no fixed sights installed.
• Magazine capacity is 30+1 rounds, with one magazine included.

Frequently Asked Questions

What trigger does the M400 Tread use? SIG’s Matchlite two-stage trigger.

Is the barrel stainless steel? Yes, a 16-inch stainless steel barrel with a 1:8 twist.

Is the safety ambidextrous? Yes, allowing manipulation from either side.

Buy the SIG Sauer M400 Tread 5.56 NATO Rifle, 16-inch, Stainless Barrel, M-Lok, 30-Round

This M400 Tread is a proven pick from our AR rifles lineup. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.