I am looking into possibly getting this pistol as it would be my first HK firearm and first polymer one as well. I need a little insight into this pistol from anyone familiar with it. I already understand that it is considered an iconic pistol but I am wanting some operational information about it. How is the trigger action on this pistol? I have heard from some sources that the double action is not very good and the single action is OK. Can the hammer spring be replaced with one that is significantly lighter than what comes stock on the pistol? Does the dual recoil spring system make a significant difference in felt recoil? Any other things about this pistol that makes it great?