KRISS MagEx2 Kit for Glock 21 – +17 Round Extension, 3-Pack

The KRISS MagEx2 Kit extends Glock 21 magazine capacity by an additional 17 rounds, converting standard 13-round .45 ACP magazines into 30-round extended magazines. This kit is designed for shooters who need substantially increased capacity without purchasing entirely new magazines—ideal for competition, training, or defensive applications where higher round count matters.

Each MagEx2 extension is manufactured from reinforced polymer and includes an extended spring and follower assembly. Installation requires disassembly of the factory magazine and replacement of internal components—basic mechanical aptitude is required but no gunsmithing tools are necessary. The extended baseplate provides additional gripping surface and maintains reliable feeding geometry. This 3-pack allows you to convert multiple magazines at once.

• Part Type: Magazine Extension Kit
• Compatible Firearms: Glock 21 (.45 ACP)
• Capacity Increase: +17 rounds (13-round magazine becomes 30-round)
• Material: Reinforced Polymer
• Installation: User-installable, requires magazine disassembly
• Includes: (3) MagEx2 Extensions, (3) Extended Springs, (3) Followers