Sig Sauer RM40016BTRDV2 M400 Tread 5.56x45mm NATO 30+1 16″ Stainless Steel Barrel; Black Hard Coat Anodized Picatinny Rail Aluminum Receiver; M-LOK Handguard; Black Synthetic 6 Position Magpul SL-K Stock; Black Polymer Grip, Ambidextrous

The M400 TREAD features a free-floating M-LOK enhanced handguard that is lightweight yet rigid for extreme control and ease of mounting accessories such as lights and handstops. The lower receiver has an ambidextrous safety for right or left-handed operation and includes an integrated QD mount for easy sling attachment. The M400 TREAD features a stainless steel barrel offering durability and corrosion resistance while improving accuracy; 3-prong flash hider; 1:8 twist rate; mid-length gas system; SIG Matchlite 2-stage trigger; MAGPUL SL-K telescoping stock for easy adjustment and a customized fit.