KRISS USA MagEx2 Kit for Glock 21 – +17 Round .45 ACP Extension

The KRISS MagEx2 Kit extends Glock 21 magazine capacity by an additional 17 rounds of .45 ACP, transforming a standard 13-round magazine into a 30-round extended magazine. This kit is designed for shooters who need higher capacity for range training, competition, or use with pistol-caliber carbines chambered in .45 ACP that accept Glock 21 magazines. The MagEx2 provides a cost-effective alternative to purchasing new high-capacity magazines while maintaining reliable feeding.

The kit includes a magazine extension body, an extended spring, and a floorplate. Installation is straightforward: disassemble the existing Glock 21 magazine, replace the factory spring and floorplate with the MagEx2 components, and reassemble. No gunsmithing or permanent modification to the firearm or original magazine is required. The extension is constructed from durable polymer to match factory Glock magazine reliability.

• Part Type: Magazine Extension Kit
• Compatible Firearms: Glock 21 (.45 ACP)
• Capacity Increase: +17 rounds (30 rounds total with standard G21 magazine)
• Material: Polymer
• Installation: Drop-In (user-installable, no gunsmithing required)
• Includes: Extension body, extended spring, floorplate