So I just got five .40 caliber Arrendendo +5 magazine extensions (baseplate and new spring). This is for a USPSA limited Glock 35 and increases my magazine capacity to 20 rounds. The problem is......these things seem unreliable. Reloading with a Upula will jam rounds down into the mag and you need a tool to get them back up. Hence, I have to load by hand and even then......some rounds want to nosedive or not fully feed upward (i.e., the slide will pass over and not pick up another round). Note--my same gun with factory Glock mags has not had a malfunction in over 7000 rounds. Has anyone experienced this? Is there a fix? The extra 5 rounds makes a big difference in competition. Thanks in advance.