Details Shipping The M400 TREAD pistol is optics ready and features an aluminum frame pistol. It has a carbon steel nitride finished barrel with a free-floating M-LOK handguard, a single-stage polished/hard-coat trigger, ambidextrous controls, a Blade 2.0 Pistol Brace stock and a mid-length gas system. Oal 27" Grips Black Polymer Action Semi-Automatic Sights None, Optic Ready Weight 6.00 lbs Caliber 556 nato Capacity 30+1 Stock Finish Black Weight Range 6.00 lbs to 6.99 lbs Barrel Length 11.50" Stock Material Synthetic Barrel Length Range 11.00" to 11.99"