I want to replace my Colt compact's plastic factory trigger with a Harrison Design trigger. What length is the factory trigger? Harrison offers short, medium, and long. I would like to keep the same length. I don't think its a short trigger. I would also like to swap out the ambi safety. I've got one right now that has the tab that slides under the right grip panel. My Kimber full size has an ambi safety that does not have the tab and uses a modified hammer pin. It feels like it engages much better than the one on my Colt. Wilson has a similar model for triple the price of the Kimber and Caspian has one that looks like it uses the modified hammer pin but still has the grip tab. I am a lefty. Is the Wilson worth the price difference?