Description Advantage Arms offers a dedicated .22 Long Rifle conversion magazine designed for Glock G20 and G21 platforms. This polymer 10-round magazine is intended for use with an Advantage Arms rimfire conversion kit to provide an economical training option. It includes a last-round hold open and is finished in black to match service-style frames. The magazine requires the corresponding Advantage Arms Conversion Slide Kit (not included) to function as intended. Key Specifications The magazine capacity is 10 rounds. The cartridge is .22 LR (long rifle rimfire). The construction material is polymer for lightweight durability. The finish is black. Designed to fit Glock 20 and Glock 21 frames when used with the Advantage Arms conversion kit. Includes a last-round hold open. Requires an Advantage Arms Conversion Slide Kit (sold separately). Product type is magazine intended for training and range use. Package contains 1 magazine. Purpose-built to simplify rimfire training on full-size Glock platforms, this Advantage Arms magazine provides a practical, no-nonsense solution for routine range sessions. Its straightforward polymer design and last-round hold open keep operation reliable and easy to manage for repeated practice with .22 LR ammunition.