I just picked up a Kriss mag extension for my G21. Being the tinkerer that I am, why not try to fit the extension to a G20 mag? Everything appears to work except the spring. The follower spring is different between the G20 and G21. Anyone happen to know where you might be able to pick up a longer follower spring for the G20 mag or could get one made? Any ideas or info is aprreciated. I tried to contact Kriss for any help but I have to say that the customer service is lacking.