The new Kel-Tec RDB bullpup rifle is essentially the same weapon system as the original Kel-Tec RFB, except the new RDB is chambered in .223/5.56, whereas the RFB is chambered in 7.62x51mm.
Kel-Tec's RDB comes with a 17.5-inch barrel with 1-in-7 twist, and operates with an adjustable short-stroke gas piston.
It also features a polymer Picatinny rail on top and bottom of the bullpup chassis. The RDB weighs 7-pounds, accepts standard AR-15 magazines and ejects empty casings out the bottom of the action.
The Kel-Tec RDB bullpup rifle will be available in the fourth quarter of 2014 for $2,000.