I shoot a G23 with a KKM conversion barrel. I use KCI mags in conjunction with some 10 round CA. Mags to shoot IDPA locally with them and have had no feed issues out of about 800 rounds. You really should not pay more than $17 per mag for the 10 rounders as you can get new hi cap from Glock for about $23, I think I paid $10 each for mine. The KCI works fine for the range I have found them to be decent mags.