I have a Glock 23 Gen. 4, bought new June '11. I have put 200 target rounds through it, [180 grain WWB.], functions perfect no FTF FTE, never holstered, no scratches or blemishes, like new. The problem is the .40 has to much snap for me. I would like to trade the 23 for a new Glock 19 gen 4. I know about a 9mm conversion, don't want to do that. At the dealer how much cash do you think it will cost me to make the switch?