Add weight and style to your magazines with the Taylor Freelance Brass +5 Extension for Glocks! Designed with USPSA Limited Division in mind, these extensions give you the edge in magazine capacity, and weight! Adds 5 rounds of 9mm to your Glock 17 or 19 magazines. Adds 4 rounds of .40 caliber or .357 SIG to your Glock 22/31 or Glock 23/32 magazines. Works on all generation of Glock magazines.