Thanks for the replies. I guess I don't need a third 320 but for me a compact 320 RX with the small grip module and a safety would be my perfect carry gun. I assume I could swap slides without a problem.When Sig says they will have other grip modules eventually they might not mean in my lifetime, about three years ago I was told by Sig on their facebook page the the HD all steel 930 would be out shortly. As far as getting a grip module with the cut out marked, not much chance of even getting a small grip module right now.