Sig Sauer M400 Tread V2 5.56mm NATO 16in Disasters Earth Semi Automatic Modern Sporting Rifle - 30+1 Rounds - 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. Chambered in 5.56mm NATO, the M400-TREAD has a 16in stainless steel barrel offering extreme durability and corrosion resistance while improving accuracy.