The newest iteration for Kel-Tec, RDB stands for "Rifle Downward-Ejecting Bullpup." This nifty looking polymer firearm features fully-ambidextrous control, is lightweight and has low recoil. Chambered in 5.56 x .223, the RDB has a 17 1/2-inch barrel, is operated by a short-stroke gas piston and takes standard AR magazines. And after the last shot exits this gun, the bolt holds open.
Along with the M43, this gun was a hit at the 2014 SHOT Show. The RDB is now available for NRA members to get a first-hand look on the floor of the 143rd NRA Annual Meetings & Exhibits. But if you're unable to get to the show this year, check out the gun in the video below.