The grip is different. It is about 1-9/32 wide and 2 long. My Gold Cup is about 1/64 narrower and about the same length. I do have Colts rubber grips on it. If you take off the grips the single stack is smaller. Having said that I have been shooting this grip style for 7-8 years and a single stack feels funny.
I have not yet fired this gun. I have fired my sons hybryd 40 modified gun that has the same front sight config. I don't notice much difference but then I need to fire more. Don't we all.
The pics I posted were taken by the factory SVI. I guess you can buy the gun just the way I got it. Bye the way it is all stainless steel. The light on the bottom is both a laser pointer and a white light flash light. It is really cool. On the back of the light on the bottom is a 4 position switch
3) white light
4) both laser and white light
above that is a three position rocker switch
right side down light on locked
left side down light on spring return