I have good things about Springer Precision and Powder River's trigger kits for Springfield XD. I need a little insight from someone smarter than me. Springer's trigger kit replaces the sear and the trigger bar and springs. Powder River's trigger kit replaces the striker safety lever, springs and adds an over travel stop. I don't know a lot about the inner workings of a semi-automatic pistol but it seems each company accomplishes the same goal using completly different parts. Which is better or are the end results about the same?