At the 2008 SHOT Show held from February 2 to 5 in Las Vegas, Nevada it was declared by Kel-Tec representatives that the RFB rifle would be made available to the public by the 4th quarter of 2008.

Later, the Kel-Tec website stated that the 18 in (460 mm) barrel carbine variant would not be shipping until February 2009 due to a change in the production process intended as preventive measures against potential gun control legislation.

[10] A mil-spec Picatinny rail is provided for mounting a wide range of optics and tactical accessories.

Meanwhile, Kel-Tec has introduced similar bullpup rifles in 5.56mm called the RDB and the M43, released in 2014.

[11] Kel-Tec has produced at least four versions with differing barrel lengths, weight, overall length, and performance: The Target version also features a five-way adjustable trigger, for a trigger pull from 2 to 6 lbf (8.9 to 26.7 N).