I have done a little searching and haven't happened upon anything like what I am looking for. I was hoping for a tidbit from you. What I want is probably going to sound a bit odd to you, but I am wanting a heavier trigger pull on my S&W M&P 40. It's completely factory right now, and there's nothing wrong with that. However, as someone who is used to a 8-10lb trigger on a primary carry piece, the 4.5lb I currently have is a little nerve racking. As for all of you that are about to jump on the keep your finger off the trigger thing, I know that. I am totally aware that if you don't touch the boom switch it stays quiet. But I personally am the type of guy that likes to feel that longer stiffer squeeze. I have always carried a DA wheel gun or a DA/SA pistol. I do realize that my M&P is a DAO, but it's a very light crisp feel which is great for precise target shooting. But the thing is that I don't use thing pistol for that, I have a fun target handgun. I like the way feels as is, but still am more comfortable with what I want. So, if any you know where I can find a stronger spring to put in place on my pistol, much thanks would be obliged.