Sig Sauer released a new variation of the M400 family today called the M400 Tread. The Rifle has a 16" stainless steel barrel (1 in 8" twist), 15" free float MLOK hand guard, ambidextrous controls, single stage polished / hard-coat trigger, mid-length gas system and Magpul SL-K stock.
The part number is RM400-16B-TRD 798681597765.
Specs from Sig:
