According to my 2002 factory armorer manual, the P239 was available in a DAO version. Based on the illustration in the manual, when the DAO hammer was installed in the pistol I can’t see how it would be possible to distinguish it from the normal DA/SA hammer. The DAO pistol would, however, not have a decocking lever. I suspect that DAO P239s were even less common than other model DAO pistols, and the latter were very rare.
P239s with DAK triggers, however, were readily available at one time, and that’s a type of DAO system. DAK P239s obviously do not have decocking levers either, and their hammer is somewhat different in appearance from the DA/SA hammer. The DAK hammer is smooth without any engagement grooves to facilitate manual cocking.
Welcome to the forum, BTW.
“Without its tough spearmen, Hellenic culture would have had nothing to give the world. It would not have lasted long enough. When Greek culture became so sophisticated that its common men would no longer fight to the death, as at Thermopylae, but became devious and clever, a horde of Roman farm boys overran them.” — T. R. Fehrenbach, This Kind of War
Posts: 39097 | Location: 10,150 Feet Above Sea Level in Colorado | Registered: April 04, 2002
Just to say it, for years I carried a DA/SA decock only pistol of one sort or another... but for the last year I've switched to DAO... just to see... I know that in most close on shooting situations, say within 20ft I personally can pretty much drill center mass with double action only.