What's in the Box Sig Sauer M400-Tread V2 TacPac 5.56 NATO Rifle (3) 30-Round Magazines (1) ROMEO-MSR Red-Dot (1) Rifle Case Cable Lock Owner's Manual 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 5.56 NATO, the M400 TREAD has a 16 stainless steel barrel offering extreme durability and corrosion resistance while improving accuracy. The barrel is also fitted with a 3-prong flash hider and has an extremely versatile 1:8 twist rate. The M400 TREAD also has a mid-length gas system offering smoother operation and reduced recoil. The new M400 TREAD includes a SIG Matchlite 2-stage trigger for enhanced control and improved accuracy as well as a MAGPUL SL-K telescoping stock for easy adjustment and a customized fit. The new M400 TREAD. All of the freedom, all of the features, with none of the compromises. Firearm Features Free Floating M-LOK Enhanced Handguard 16 Stainless Steel Barrel Mid-Length Gas System MAGPUL SL-K Telescoping Stock Ambidextrous Safety Lower receiver QD mounts Firearm Specifications Manufacturer: Sig Sauer Model: M400-Tread TacPac Caliber: 5.56 NATO Barrel Length: 16" Twist Rate: 1:8" Overall Length: 30.8" Finish: Black Stock: 6-Position SL-K Sights: ROMEO-MSR Red-Dot Magazine Capacity: 30 Rounds Additional Features: Includes ROMEO-MSR red-dot sight, three 30-round magazines, and rifle case.