kel-tec_rdb
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.