The Kel-Tec RDB (Rifle Downward Brass) is a bullpup semi-auto rifle that ejects brass downward through the bottom of the stock rather than to the side. This makes it fully ambidextrous without any modification. The 17-inch barrel sits behind the pistol grip in the bullpup format. Type: Semi-Auto Rifle Action: Direct Impingement Caliber: 5.56x45mm Capacity: 30 Year introduced: 2016, USA Weight: 7 oz Overall length: 27.5" Status: Active Intended use: Home Defense, Range, Military Surplus Users