I just got a Cash9k and made this custom SS adapter to use the Gemtech barrel nut and interface with the Alpha thread pattern of the Cash9k.
I was very skeptical that this tiny can would perform as great as the Youtuber's say. Note that all the stellar reviews are using the thread mount. Using their typical push/turn 3 lug mount places the muzzle very close to the blast baffle and I think bypasses the flow through.
The custom SS adapter I made has a bearing surface like the original short Gemtech barrel nut mount that provides additional alignment with the shortened UZI barrel. This also places the muzzle where their direct thread mount would be for best performance.
Not as quiet as my CT9KS or MK9K but being this small and light is truly amazing. It didn't ring my ears and I wouldn't hesitate to run it without hearing protection.
The suppressor module is 5.8oz and 7.5oz with the direct thread mount. I didn't weigh it with my custom UZI mount setup yet.
The tube is Titanium and the baffles are SS and the unit is fully serviceable.
I also made a custom Bixler 3 lug mount for it.