Sig Sauer M400 Tread 5.56 NATO 11.5" Pistol 30rd Optic Ready

The Sig Sauer M400 Tread pistol delivers reliable performance in a compact 11.5-inch barrel configuration, engineered for tactical applications and sporting use. This 5.56 NATO platform combines proven direct impingement operation with modern manufacturing standards. Built on Sig Sauer's established AR-15 pattern design, it offers familiar controls with enhanced reliability features.

What Makes This Different

The M400 Tread features a chrome-lined barrel with a hard coat anodized finish that resists corrosion better than standard phosphate coatings. The free-floating M-LOK handguard provides multiple attachment points while maintaining barrel harmonics. Unlike entry-level AR pistols, this model includes a flat-top upper receiver machined to military specifications with proper headspace tolerances.

Key Features

• 11.5-inch chrome-lined barrel with 1:7 twist rate for stabilizing heavy bullets
• Free-floating M-LOK handguard with full-length Picatinny top rail
• Optic-ready flat-top receiver accepts standard scope mounts and red dots
• 30-round Magpul PMAG included with textured polymer grip
• Single-stage trigger with 6-7 pound pull weight
• Hard coat anodized finish rated for 500+ hours salt spray resistance
• Standard AR-15 magazine compatibility and mil-spec buffer tube

Field testing shows consistent 2-3 MOA accuracy with quality ammunition, suitable for close-quarters applications and medium-range precision work. The 11.5-inch barrel length balances velocity retention with maneuverability in confined spaces. Gas system timing accommodates both 55-grain and 77-grain projectiles without adjustment. The M-LOK mounting system supports accessories like lights, grips, and bipods without additional rail sections.

Technical Specs

• Caliber: 5.56 NATO/.223 Remington
• Barrel Length: 11.5 inches with 1:7 twist rate
• Overall Length: 28.25 inches (stock extended)
• Weight: 6.2 pounds unloaded
• Magazine Capacity: 30 rounds (included)
• Finish: Hard coat anodized black
• Handguard: Free-floating M-LOK aluminum
• Trigger: Single-stage, 6-7 lb pull
• Made in USA with limited lifetime warranty

This configuration meets the demand for a reliable, accurate platform that accepts standard accessories and ammunition. The established reputation of Sig Sauer's manufacturing quality backs every component. Current production models ship within 3-5 business days.