Ultra-compact pistol configuration of the MCX Rattler — 5.5" barrel variant. Competing with the base Rattler for shortest MCX variant; suited for vehicle use and close-quarters applications. Type: Pistol Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2017, USA Weight: 123.2 oz Overall length: 35" Status: Active Intended use: Personal Defense, Service