In an effort to stay true to the profile of the U.N.C.L.E. suppressor, I asked Joe Hayes about the possibility of excluding the threaded skirt—much the way an AR-15 flash hider attaches directly to the barrel. The end result will not only be more authentic, it turns out to be easier from a manufacturing standpoint. Chalk one up in the win column despite the change.
Sadly, my idea concerning a .22-caliber chamber adapter enabling me to fire .22s one at a time from the pistol is a different matter. After discussing the subject with Joe at length, it doesn't appear possible due to such things as constructing a removable spring-loaded striker for the back of the .22 adapter to accommodate for rim-fire firing pin offset and overall space constraints for the adapter inside the 9 mm chamber.
Oh well, you know what they say about the best made plans of U.N.C.L.E. Agents and gunsmiths.