I had a lot of problems with feeding issues from my original mag springs. After seeing a video about Glock 43 + 15 springs that will work with Hi-Point mags, I bought some for my pistol and carbine. Here's my updated review on the springs from Ghost Inc: "I had a chance to get back to the range this last weekend, and wanted to get this update in. After leaving my mags loaded with 8 rounds for a number of weeks, the springs had adjusted enough to allow me to load the mags to their full 10 round capacity. I left the mags that way for at least 4 weeks, and when I went to the range this last weekend, my mags worked flawlessly with no jams! I recommend these springs to every owner of a Hi-Point .40 cal pistol, and the carbine as well. Thank you for a great product that solved my feeding issues." I'm a happy camper now that I can depend on my pistol to be reliable in case I need it to defend myself or a loved one!