>> he comb through the record for each of those guns. none matched up until rubin read to the second to last file. it was a gun turned in by a tourist from montana who spotted by the side of the belt way. the only reason the man saw it because he was parked in d.c.'s famous bumper-to-bumper traffic. >> i said let's get this gun, it makes sense. >> one in a million. >> in believerable odds. >> the one was a mess and missing most of its components and it looked it may have been run over. the barrel is intact using spare parts that the police firearms