Sig Sauer M400, Tread V2 Coil, Semi-automatic Rifle, AR, 223 Remington/556NATO, 16 Stainless Steel Barrel, Flash Hider, Mid-Length Gas System, Anodized Finish, Black, Sig Sauer Grip, Magpul SL-K Stock, Free Float M-LOK Enhanced Handguard, SIG Matchlite 2-Stage Trigger, 30 Rounds, 1 Magazine, Romeo5 Gen II Compact Red Dot Sight RM400-16B-TRD-V2-COIL The M400-TREAD V2 continues the legacy of one of SIG SAUER's most popular modern sporting rifles, incorporating upgraded features based on user feedback. Designed to improve performance and value, the V2 models include an upgraded free-floating handguard for better control and accessory mounting, along with the precise SIG Matchlite 2-stage trigger for smoother breaks and increased accuracy.