The SIG MPX Copperhead is a compact variant with a 3.5-inch barrel and a more streamlined receiver profile compared to the standard MPX-P. Gas-operated with the short-stroke piston shared across all MPX models. Designed for close-quarters use and sold as part of the competition-focused SIG lineup. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 30 Year introduced: 2019, USA Weight: 60.5 oz Overall length: 14.5" Status: Active Intended use: Competition, Law Enforcement, Home Defense