SIG SAUER, SIGM400, Tread Snakebite Coil, Semi-Auto, 223 Rem | 5.56 NATO,  Stainless Steel, Collapsible / Folding Stock, Magpul (FDE) SL-K Grips/ Stock, 16" Barrel,  30 rd. 1 mag, ROMEO5 Tread Red Dot, Adjustable Sights, 1/2x28 threaded barrel, : Threaded Barrel, Coyote (FDE), Free-Floating M-LOK Handguard, Sig Matchlite Trigger, Ambidextrous Controls. 
The TREAD COIL sets a new standard in performance and value in the AR category. With installed accessories including ROMEO5 Red Dot Sight, Flat Blade Enhanced Trigger, and 13” lightweight handguard, the COIL is the perfect rifle package for the avid user or first-time buyer. Other features of the TREAD COIL include the precision 16” stainless barrel, ambidextrous controls, and 6-position Magpul SL Stock.