This magazine will fit a Glock 19 and hold up to 15rds of 9mm ammo.ProMag magazines are designed utilizing modern precision injection molding of Mil-Spec polymer compounds. Every ProMag magazine is backed by a lifetime guarantee against manufacturer's defects. Features: Magazine body constructed of a proprietary DuPont Zytel based polymer Magazine body has full length steel internal insert stamped and welded like the factory magazine Injection molded magazine follower Spring is made from heat treated chrome silicon wire Made in USA