The SIG Sauer MCX Spear is the civilian semi-auto version of the US Army XM5 (NGSW-R), chambered in the new 6.8x51mm Common Cartridge. One of the most advanced service rifle designs commercially available. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 6.8x51mm Capacity: 20 Year introduced: 2022, USA Weight: 9.8 oz Overall length: 35" Status: Active Military use: Yes Intended use: Military Collector, Precision, Tactical