The Glock 21 is a full-size .45 ACP pistol, and the first one that offers high capacity of 13+1 rounds for this caliber. It has a polymer frame that reduces weight compared to steel counterparts. Its dimensions, with an overall length of about 8 inches, make it ideal for duty use rather than concealed carry. The Glock 21 is praised for its smooth shooting experience and reduced recoil, making it one of the most comfortable .45 caliber handguns. It features standard 3-dot sights and 3 internal safeties that ensure a reliable and secure shooting experience. The Glock 21 Gen 3, introduced in 2007, retained the pistol's core features while improving ergonomics with a more textured grip for better control and comfort. The Gen 4 model, released in 2010, enhanced the grip with interchangeable backstraps for a customizable fit, incorporated a dual recoil spring assembly for reduced recoil, and included a larger magazine catch for easier handling. The latest, Gen 5 version, introduced in 2017, offers a nDLC finish for improved durability, a flared magwell for faster reloads, and an ambidextrous slide stop lever. Each generation has built upon the Glock 21’s solid foundation, enhancing performance and adaptability for various shooting needs.