The MCX Rattler is an ultra-compact pistol-configuration MCX with a 5.5-inch barrel optimized for suppressed use. The side-folding brace and collapsing stock options make it one of the most compact tactical carbines available. Designed for vehicle crews and special operations. Type: Semi-Auto Pistol Action: SA Caliber: 5.56 NATO Capacity: 30 Year introduced: 2018, USA Weight: 64 oz Overall length: 16" Status: Active Intended use: Tactical, Collector