I use that for rattlers when I find them around the house.
I never thought of building a choke!
Well... now I have some bad news for the wife. Clearly I require a .22 with a threaded barrel. It’s a safety issue.
The Ruger Charger fits that bill!!!
Built on a 10-22 with a threaded 10 inch Barrel.
Around 300 bucks.
Bam!
You may find the link in post #12 useful.
You really don't need to thread the barrel, I just used a 2 foot piece of aluminum pipe and some gorilla tape.
I did remove the front sight {never used it since the 22 has a scope} so the pipe fit over the barrel and I shot and then tweaked it until I got it on correctly.
I've been using it for over 2 years and it still works fine.