The XD 4? Full Size pistol from Springfield Armory® sets the standard for polymer pistols. The XD 4? Full Size has everything you want and need in a pistol – superior ergonomics, reliable performance, and features that make it easy and intuitive to use. The XD 4" Full Size is the original XD offering from Springfield Armory®, and the most basic XD. This is the XD that started it all.