The SIG Sauer M400 Tread (SIG Sauer part no. RM400-16B-TRD-V2-10) is a 5.56 NATO AR-15 configured with a 10-round magazine for compliance-state buyers who still want SIG’s stainless steel barrel and Tread-series build quality. SIG Sauer pairs the 16-inch stainless barrel with a free-floating M-Lok handguard for easy accessory mounting, and an ambidextrous safety selector for fast manipulation from either shoulder. This rifle is built for shooters in restrictive states who still want a full-featured AR-15 for home defense or the range.

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 safety selector is ambidextrous.
• The upper ships without fixed sights, ready for an optic.
• Action type is semi-automatic.
• The rifle is built on the AR-15 platform.
• The handguard is M-Lok compatible and free-floating.
• Magazine capacity is 10 rounds.

Frequently Asked Questions

Why does this model have a 10-round magazine? It is configured to meet compliance-state magazine capacity requirements.

Is the barrel stainless steel? Yes, a 16-inch stainless steel barrel.

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, 10-Round

This compliant M400 Tread is ready for shooters who need it from our AR rifles category. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.