One of One Thousand - S1.E16

Pat Garrett wins an expensive rifle in a shooting contest in Fort Sumner. When he goes to collect the rifle he finds that the rifle has been stolen and the gunsmith murdered. The two suspects are Billy the Kid and MIles,an old friend and buffalo hunter who took second place in the competition. Garrett goes after the suspect with a heavy heart, prepared to arrest for hanging or to shoot down a friend.