The Kel-Tec RFB is what got me convinced that I wanted a bullpup design rifle. I already had an Armalite .308 AR10, and I love that rifle, so an RFB was out. The RFB I got to check out fully was a friend's rifle that he's had for awhile. He's a well informed gun guy with all manner of excellent handguns and rifles. He can have just about any .308 rifle that he wants, and this is one of his favorites...and he actually shoots the guns he owns...a lot...and has quite a bit of NFA stuff. Anyway, he's one of those guys who I'd give some credence to his assessment of a given gun. I liked the RFB well enough to almost immediately go out and get a 5.56 bullpup. If I hadn't already owned an AR10 .308, I would have bought one for myself...and may still in the future. Some get irritated about Kel-Tec for one reason or the other, and that's their right. Still, I think they come up with some pretty creative firearms.