Anybody have any experience with the PMAG 25 rounder 7.62 mags? I was looking at some of those ones with the window https://www.magpul.com/products/pmag-25-lrsr-gen-m3-window?ProductColor=VO343, but wanted some feedback before I bought any. I own a bunch of their 20 rounders and really like them, but have tried the longer ones. I wonder why they did not make any 30s? Just too long, or wonder if there were functioning issues...