This is certainly an older thread, you might not get a response, and could be reviving an outdated thread. Be sure to take into consideration creating a new thread. I'm basically wanting to buy a Gen4 G29/30 frame at the moment to accomplish exactly that with my Gen3 G30S slide. https://glock-30-gen-472357.blogolenta.com/29758091/the-definitive-guide-to-how-do-i-buy-a-gock-30-gen-4-online