Glock 20 extended mag springs

[frayluisfan]

Hi, all.

 

I recently replaced all my stock Glock 20 mag springs to address issues with FTF, and that solved my problem. I also have an older Glock 20 magazine with a +4 base plate, unknown manufacturer. I'm having FTFs with this one, and I'm pretty sure it's the mag spring, which is noticeably weak. I'm wondering about replacing the spring with either an ISMI GL-3 or a Wolff spring. Any experience with either? Also, Wolff lists one spring as fitting all full-size Glock mags (G 17, 20, 21, 22, etc.). Am I reading that right? Thanks in advance for your advice!