The Shield Arms +5/+4 Magazine Extension for Glock 17/22/34/45 is expertly designed to enhance your magazine capacity, adding 5 rounds to Glock 17/19X/34/45 magazines and 4 rounds to Glock 22/35 magazines. This magazine extension is crafted from durable billet 6061 aluminum with a type 2 anodized finish, ensuring longevity and reliability. It features a unique easy access floor plate design that allows you to reach the spring and follower without removing the extension, facilitating smooth operation and quick maintenance. Compatible with OEM Glock 13 and 15 round magazines, it includes a +10% power spring for dependable feeding. Proudly made in the USA, this extension is backed by a lifetime warranty and the Shield Arms Spring for Life guarantee, making it a practical choice for responsible gun owners looking to enhance their firearm's performance.