I have a question about the compatibility between a Gen 3 single spring assembly for a G22 vs the Gen 4 dual spring assembly. Are the dual spring assemblies available for the Gen 3's? Probably a dumb question but I need to know.
No, the recoil spring assemblies do not interchange between the generations. Someone makes an adapter so you can use a Gen3 spring in a Gen4. As far as I know, there are no dual spring setups for Gen3.