ProMag 13-Round Magazine for Glock 21 (.45 ACP)

This ProMag magazine is a detachable, 13-round replacement compatible with Glock 21 pistols chambered in .45 ACP. Constructed with a DuPont Zytel polymer body and a full-length steel internal insert, it is designed for serviceable everyday use at the range or in duty/backup roles. The magazine includes an injection-molded follower and a heat-treated chrome-silicon wire spring for consistent feeding. Built in the USA and intended as a reliable spare or replacement magazine for Glock 21/30 platforms.

Key Specifications

• The capacity is 13 rounds.
• The caliber is .45 ACP.
• The body material is Polymer (DuPont Zytel).
• The magazine includes a full-length steel internal insert.
• The finish is Black.
• Compatibility is listed as Fits Glock 21; compatible with Glock 30.
• Generational fit is Gen 1–4 compatible.
• The spring is made from heat-treated chrome-silicon wire.
• The package quantity is 1 magazine.
• Country of manufacture is USA.

Robust and straightforward, this ProMag spare magazine provides a practical, durable option for shooters who need a dependable replacement or an extra magazine for the range or duty kit. Its polymer body with a steel insert and precision-wound spring focus on consistency and serviceability without unnecessary complexity.