Sig Sauer M400 Tread V2, Semi-automatic Rifle, AR, 223 Remington/556NATO, 16 Stainless Steel Barrel, Muzzle Brake, Mid-Length Gas System, Anodized Finish, Black, California Compliant Grip, Magpul MOE Fixed Stock, Free Float M-LOK Enhanced Handguard, SIG Matchlite 2 Stage Trigger, 10 Rounds, 1 Magazine, California Compliant RM400-16B-TRD-V2-CA The M400 TREAD V2 is an optics ready, aluminum frame rifle. The TREAD features a 16" stainless steel barrel with a free-floating M-LOK handguard, a SIG Matchlite 2 Stage Trigger, ambidextrous controls, a Magpul MOE fixed stock, a mid-length gas system, and is available in 5.56 NATO.