When i needed replacement mag springs for my xd, i called springfield, and they shipped them right to my door. When they arrived, they'd sent me 5 recoil springs instead of mag springs. I called them back, they said, "oops, keep the recoil springs free, we'll send out the mag springs right away.
Years back when my Springfield loaded was young and new, it had POI issues, i called and they shipped me out a new tritium front sight free. When i broke the slide stop after many 1000's of rounds, i didn't bother calling, i just replaced it, figured i'd got my moneys worth already