I'm fairly new to the world of firearms and after shooting a bunch of different hand guns decided on the Glock 19. Almost went for the M&P9c but I went for the Glock in the end. I find the trigger a little painful though by the end of 100 rounds and really liked the comfort of the M&P trigger. I know people swap out the trigger for the smooth trigger of the 17. Do you do this for comfort or are there other reasons? Does this alter anything else other than just the feel of the trigger on your finger? I've read elsewhere on here (I even used the search button ) that it makes the trigger pull a little lighter.