The RDB (Rifle Downward Ejecting Bullpup) ejects brass straight down beneath the action, making it fully ambidextrous with no brass-in-face issues common to other bullpups. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2015, USA Weight: 84 oz Overall length: 27.5" Status: Active Intended use: Tactical, Sport, Survival