The ProMag Industries GLK-A21 20-Round Magazine for Glock 17/19/26 delivers unmatched reliability and performance for your firearms. Manufactured in the USA, it features a robust design that ensures durability and longevity. This magazine is precision-engineered for Glock 9MM pistols, combining superior materials with meticulous assembly processes. Enjoy seamless operation with components that meet the highest quality standards. 20-Round Magazine Compatible with Glock 17/19/26 9MM Pistols Constructed from Proprietary Dupont Zytel Based Polymer Full Length Steel Internal Insert for Enhanced Stability Injection Molded Magazine Follower for Reliable Feeding Heat Treated Chrome Silicon Wire Spring Made in the U.S.A. Choose the ProMag GLK-A21 for exceptional performance and a lifetime guarantee against defects.