The Glock 21 is remarkable for its accuracy and light recoil, and the Modular Back Strap system makes it possible to instantly customer the grip to accommodate almost any hand size.  The reversible mag catch makes it ideal for left or right-handed shooters.  The Gen 4 system is the perfect compliment to the .45 ACP cartridge.  Also available in an SF version. You can find not only the Glock 21 for sale on this page, but also Glock 21 holsters, magazines, accessories, and parts.