The [[Kel-Tec RDB]] (Rifle, Downward-ejection, Bullpup) is a 5.56×45mm NATO [[bullpup]] type semi-automatic [[rifle]], manufactured by [[Kel-Tec]] Industries of Florida. 

It uses a rotary bolt with a spring loaded ejector and an extractor facing down, ejecting spent shell casings downward, allowing ambidextrous use.
kel-tec rdb