I have 3 gen4 15 round 40 S&W factory glock mags and 1 extended gen4 22 round .40 mag for sale or trade for gen4 full size 9mm mags. I will sell the standard 15 round mags for $30 a piece including shipping and the extended for $40 shipping included. Located in Logansport ( northern indiana) if you would like to meet FTF.