This is a non-factory +2 extension for any Glock that is chambered in 9mm, 40s&w, 45gap , or .357sig. It will add a 2 round capacity to any double stacked 9mm magazine (models 17, 19, 26) and a 1 round capacity to any 40 s&w, .45 gap , or .357 sig double stacked magazine (models 22, 23, 27, 31, 32, 33, 37). Made in China.
WILL NOT FIT .45 OR 10MM MODELS