Glock 9mm/.40 Magazine Spring

I've never made a mag before this, and these worked, so I'm guessing these are good. I'm buying more.

I have had 0 issues with these springs I think I have bought 30+. They work great for the 25 round FCG-9 mags, they also work as high power mags for the 17 round glock mags. I found that a 3D printed 17 round mag with these springs works better and more consistently than Magpul 17 round mags.