I do not rework these anymore, but, the soumi bolts are very easy to convert to a floating firing pin and machine to a bunch of different home builds.
I did some square ones to use in Tommy-Like builds and the one on the end was a 1" round to fit in an AR upper I did for Mike. Some places still have them cheap and for those who can machine them, they are easy to convert. They can be opened up to .40 and .45 also. There are proof of life videos out there of these things really working and the ease of getting them to work.
The Redneck Engineer now handles these but anyone can do it.
Hope to get some creative juices flowing and some builds going.