The Sti mags with spacers have feed problems and the MBX without spacers run fine, at this point. Magazines with spacers move the round closer to the front of the magazine but there is less contact with the feed lips. Is there a good reason to retain the spacer or replace them with full length (front to back) followers and springs? If so, MBX, Gram or Taran springs. Also considering going to a slide hold open follower like the MBX. Thanks