SIG Sauer's John Hollister details the new SBR versions of both the MPX (pistol-caliber, 9 mm, .40 S&W and .357 SIG) and MCX (rifle-caliber, .223 Rem., .300 BLK and 7.62x39 mm) from the 145th Annual Meeting of the NRA.
Metal-injection molding (MIM) creates complex, durable and reliable metal parts in things we use daily. Its ability to churn out high volumes at reduced cost endeared it to the firearm industry decades ago. Despite that fact, gun companies we asked about the process were tight lipped.