KCI USA's KCI-MZ013 magazines are engineered for reliability and endurance, perfectly fitting Glock firearms. Constructed with a robust hardened steel insert encased in durable polymer, these magazines are designed to withstand regular use without deforming or sustaining damage. Fits: Glock 21 / 21SF / 30 / 30S / 30SF / 36 / 41 Caliber: 45 ACP Capacity: 26 Rounds Body Material: Hardened Steel / Polymer Spring Material: Stainless Steel Equip your Glock with the KCI-MZ013 for peak performance and reliability.