I haven't changed my springs or trigger pull on my 640-3 but I have gone thru trying different grips for daily carry and range. I was not impressed with the factory rubber grip. Gone. Tried Pacmar Gripper since I like 3 finger grooves. Closed backstrap. Not bad but a bit of "bite" between my thumb and finger when shooting 158gr FMJ range ammo. Then I got a Hogue Battan grip. Two finger, open back strap, (elimates the bite because you can grip the back strap directly) small and I don't miss the "pinky" grip. Looks like I found the best grip for my 640.
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