Anything special about a 19-4 4' bbl. from a retired DEA? Was the 19 ever a service issue at some point in time? I'm told the gun has history and is in 98% with a blemish / holster wear on the cylinder. It wears Pachmayr presentation's the factory wood, box, tools, papers are gone. The price / trade is very reasonable I just want to know if anyone knows more about DEA guns.