The KRISS Vector has been on the market for a couple years now. Their problem is that the gun is a SMG, not a rifle or a pistol. It really needs to have a short barrel and a stock to work properly. They’ve tried every which way they can to get around the NFA prohibition on unregistered short barreled rifles, including offering a 16 inch version with a hilariously long “barrel shroud” disguised as a silencer. Now, though, they’ve finally embraced the SB Tactical pistol arm brace, and are offering a version of the gun with the brace installed at the factory . . .
Also coming down the pike are new calibers. The 9mm version started shipping in Q4 of 2015. I shot the full auto version…and it was absolutely delightful. It had none of the problems I found with the .45ACP version. Up next: .40 S&W with .357 SIG following shortly thereafter.
The nice thing about all these different calibers is that the gun uses an interchangeable barrel system. Buy one gun, and you can get a caliber conversion kit for anything else you want shipped to your door. The one exception might be a .22lr version (which is still on the drawing board). They aren’t sure if they can make it interchangeable with everything else, but will cross that bridge when they get to it.