B&T had a lot of these and stuff that looked like it at the show. There was a micro compact version in .380.
They seem to be making a few missteps in their bid to become something other than a silencer company. This would seem to be one of them. Like trying to build/sell a modern MAC 11. Someone should tell them the 80's are in the past. I would have gone with 2-3 basic models and left it at that. Just my opinion. I don't see any real domestic LE sales for this stuff.
They are a Swiss company, Switzerland has some fairly restrictive laws about export of Swiss firearms for military use or to other governments, possibly US manufacture and US State Dept. oversight allows them more exports from here to the third world or something. Near universal use of soft armor these days would seem to be a contra-indicator for the use of 9mm shoulder fired platforms in the real world.
I have only my MP5SD remaining. The modern SMG is called a PDW, pretty much either the P90 or the MP7. I would "sort of" prefer an MP7, but since I can't get one, that leaves me in P90 land. Don't misunderstand, although it's my second choice, it grows on me. FN Specialties has some really cool upgrades such as oversized cocking knobs, even a replacement tri-rail receiver that's better than the FN receiver, drops your sightline/bore offset by 2 inches or something. One of those, CMMG short barrel and a few other bits and you have a very serious SBR piece of gear.
The thing about the P90 I never liked was putting the left hand thumb through the same hole your trigger finger goes through. A Gemtech HALO titanium with a suppressor cover solves that problem. The mags are awkward to carry due to length but super lightweight and you do get 50 rounds. The progressive trigger (for Post Samples) seals the deal. I can't tell you how much I love a progressive trigger. Even an SBR offers a lot in a small package, the gun and 3 spares is 200 rds. and the longer 10" barrel over the Five-Seven pistol makes the SS198 Green Tip LE/Mil round (but widely available on GB) capable of defeating IIIA soft armor. It's my new house gun these days. I topped it off with an EoTech with NV settings for easy use with my NVG's. IR laser as an aiming device is dead except for hobby use, other people have NV as well. When you have something like this, you start asking yourself why you have all that other "clutter" that you mostly never shoot in the safe. YMMV.