I have four Kadets, one dedicated Kadet pistol and three Kadet adapters. The dedicated pistol and one adapter are fitted with threaded adapters for suppressors.
One thing I'll note, and people don't always agree with me on this, but I'd recommend having one installed that is reasonably easily removable. One of my adapters was designed with a fair bit of wrench flat exposed so it can be removed. The other the smith loctited in and the wrench flat was left so thin that I'll wreck the adapter getting it off. The problem I find is the adapters fill with lead which will affect accuracy. The smith who installed the thin flat adapter told me he designed it to not be removable because it doesn't need to be removed. But if you can't remove it, it's tricky to really clean the lead out of the adapter without damaging the crown.
