Yet another 5.7 "pistol," this one from Diamondback.



Also has a 'brace.'

What I don't get (in addition to why all the interest now in the 5.7 cartridge) is why in the hell Diamondback used a dual-piston operating system (not even sure what that means). After all, the FN P90, the original full-auto PDW, the weapon this round was created for, still uses a straight blowback. Not sure what they're getting from a gas system, except reduced recoil, but it's not exactly a punishing round to shoot in any case.

Estimated MSRP $1300.