Wildturk - yes it is DAO - can not manually half cock it.
I did find it on Lispsey website:
http://www.lipseys.com/itemdetail.aspx?itemno=RUKGP141RLS&mfg=Ruger&family=GP100+Series&model=GP100&type=Revolver&caliber=357+Magnum+%7c+38+Special
No it does not appear to be an import or special...
Greetings All,
Long time lurker.
I have a few Rugers - a pair of New Vaqueros and a SP 101 - 3".
I shoot CAS most of the time.
Glad to be here.
I've been looking for a GP-100 for a while now and just picked one up today.
I have never seen this model before and can't find any information...