A sporterized Mauser in .30-06 Springfield is a military surplus bolt-action rifle—most commonly built on the legendary Mauser 98 action—that has been modified by a gunsmith or hobbyist for civilian hunting, target shooting, or sporting use. Because millions of these highly durable, smooth-cycling military actions were available cheaply after both World Wars, converting them into the popular American .30-06 caliber became a staple of 20th-century firearms culture. [1, 2, 3, 4, 5]