Describe the chain of events that leads to the rifle being above Harv Kline's fireplace.

Cornish McManus builds it; John Byam buys it and uses it; Sarah steals it and hides it; decades elapse; an editor's children find it; the editor sells it to an antiques dealer; the antiques dealer sells it to a gun collector; the gun collector sells it to Tim Harrow; Harrow trades it to Kline; Kline hangs it on the wall.