On "I Have This Old Gun," we examine the early American-made 1803 Harpers Ferry flintlock rifle. Reenactors dressed as World War II era U.S. marines fire the Browning M2.

George Knapp, longtime Lewis and Clark re-enactor, holds a Model 1803 Harpers Ferry rifle Thursday morning at Travelers' Rest State Park near Lolo, which he says may be "the holy grail of rifles ...