Kel-Tec's RFB rifle is a bullpup design. In fact, RFB stands for "rifle forward ejection bullpup." Chambered for 7.62mm cartridges, the RFB has a Picatinny rail and fully ambidextrous controls. The trigger has up to five individual adjustments, and the safety disconnects the trigger and blocks the hammer action. RFB rifles use FAL magazines.