Talked to a Wolff Springs Tech the other day. He said that the mag. ext. for Glock 26 & 27 are a bad idea-when using the stock Glock mag. spring. He said the stock mag. spring wasn't meant to accomadate the two extra rounds the mag ext. gives you. The pinky ext. is fine because it does not alter the capacity of the mag. Would appreciate some feed back from my Glock Bros.