The MHS will be an open-caliber competition that will evaluate larger rounds such as .357 Sig, .40 S&W ... "Most of the guns in .40 caliber on the market right now were actually designed to be 9mm ...

These firearms include those chambered for.357 Sig, 10mm, .40, .45, and even .50 caliber ammunition — all of which are larger than 9mm rounds.