Could not fully load my new 13 & 15 round magazines which are marked Shield Plus. Checked the bottom of the followers and the spring is NOT hanging up on mine. Tech support said load them up and wait, try again. Helped on some after a few days, others took longer even with a mag loader. Also bought a Holosun 407 K GR X2 green dot and the incl screws did not work. You need 1/2 inch 6-32 screws for mounting this, so found elec wall switch plate 6-32 screws in black, slotted head but oh well. Use blue thread lock and a quick fix. Low cost too.