On a different note, the survival RDB is hideous! I own a RFB and it's a slick, innovative .308 bullpup. I had a chance to buy a RDB but passed on it since I already own a highly customized (by Ken at K&N Aerospace) Bushmaster M17s bullpup chambered in 5.56 NATO ... and couldn't see picking up another 5.56 NATO bullpup just yet (but I'd like one eventually). I did find it intriguing that the survival RDB was stated as being chambered in .223 ... and am hoping that's a misprint ... since it's perfectly safe to use .223 in a 5.56 NATO chambered firearm ... but not vice versa.
The Suervival RDB is just a small (and perhaps California Legal... maybe) version of the upcoming RDB. It currently has problems with Quality control at least on the forums, but the design and price point of the RDB make it attractive, and yes it's designed for .223. From the videos and what a friend says, that when it's working it's a joy to shoot and fairly accurate, thought he survival's barrel is a little too thin.
The best Alternative that seems to be coming out is the .308, but changeable calliber Desert Tecfh MDR, which has been delayed by testibng to make sure it DOES NOT have the Kel-Tec style QC issues and another friend hqas ordered one but it may not ship until July.
Me? if it's made after 1945 I am generally not interested XD.