>>63989842
Nopel reworked Humphrey's mega pistol into what is by all accounts a functional 40 shot .22 short handgun. The original was a bit of a unicorn in the community, I haven't tried to make one yet, but it's on the list.

https://www.thefirearmblog.com/blog/2021/06/23/diy-mega-pistol/
https://www.print-a-22.com/hw4/