My family is getting me the Springfield Loaded for Christmas. I'm sure I don't want their 2 piece guide rod. I just got an email for Wilson having a sale. So, I want the standard GI guide rod and plug. (probably bullet proof model). Am I correct in thinking I can use the factory recoil spring? I also see they offer a kit with the GI guide rod, flat wire recoil spring and shock buff. Yup, here we go again. What does the flat wire offer over the regular? As usual, thanks for the education.