Ammo Armor AA-23 Magazine Protector Compatible with: Glock G20, Glock G21, Glock G40, and Glock G41. Be Responsible, shield yourself from the dangers of damaged ammo and jammed magazines with Ammo Armor Magazine Protector. It'll be the best 12.99 you ever spent, and the cheapest insurance for a sure shot. Proudly made in the United States, the Ammo Armor is a polymer cover designed to be impervious to cleaning solvents and high heat, making it ideal for magazine storage and protection. For EDC keep lint, dust and debris clear of the clip that's backing you up. Because the Ammo Armor is designed to protect the part of your magazine that goes inside the firearm, it works perfectly with standard magazines, extended magazines, and even magazines that have a pinky extender. Each Ammo Armor is designed for a specific firearm's magazine. Be sure and search for your firearm's model Ammo Armor, and protect your gun's ass(et).