The MDRX is the updated successor to the MDR, adding an improved trigger, enhanced feed ramp geometry, and refined forward ejection system that addresses reliability issues in the original MDR. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2020, USA Weight: 112 oz Overall length: 26.5" Status: Active Intended use: Tactical, Hunting, Sport