Nelson Custom Guns 22 Conversion Kit
I got one of their conversion kits the other week.
I got an unthreaded barrel with iron sights. They're available in any combination of irons or weaver rail and threaded or unthreaded.
I'd like to start off by saying Larry is a stand up guy. He was very easy to get a hold of and returned calls and emails very quickly. There was a communication error but he dealt with it quickly and more than fairly IMHO.
I was just able to run 100 rounds of CCI through it before work the other day. It functioned perfectly on my TRP frame.
I'll post more pictures, information, and groups later.