Just reintroduced to Glocks (23C) with new job and I was wondering about getting some extended mags for back up. Found some 22 rounders (160 MM length) for like 36.00 Would adapt my extra mag carriers to accommodate them. Anyone with any experience with these? Pros/cons/dos/donts? Currently using the standard Glock mags for back up. (13 rounders?) Thanks in advance. Man, I love this forum!!