The gun manufacturer has geared the new submachine gun toward the US civilian market as a 9mm "pistol," but its select-fire version could trigger interest from the US military.
"The MPX Copperhead considerably reduces the length, width, and size of the MPX platform making it the most compact addition to the MPX family of firearms," Tom Taylor, Chief Marketing Officer and Executive Vice President of Commercial Sales at SIG SAUER, Inc., told Shooting Illustrated in an interview last month. "The Copperhead is the perfect combination of the features and performance our consumers expect from a SIG MPX in a compact package."
The submachine gun incorporates a three-and-a-half-inch barrel and has a total length of 14.5-inches. It is much smaller than a traditional submachine gun and weighs only four-and-half pounds, which is a 30% reduction in weight compared to the AR-15 style rifle.
The civilian version has a barrel with a flash hider machined at the end. The military version has a threaded muzzle that allows for a quick-detach system like a sound suppressor.