The Sig Sauer MCX Rattler .300 BLK is a usa-made semi-automatic rifle chambered in .300 Blackout, introduced in 2017. Primary use: sport, military, hunting. Type: Rifle Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2017, USA Weight: 112 oz Overall length: 32" Status: Active Intended use: sport, military, hunting