The DelGrego's do not work on Parker Reproductions any more---haven't for many years.

Here are two gunsmiths I'd look at for the Repro work you want done:
Mark Beasland www.mbabllc.com and Brad Bachelder
http://www.bacheldermastergunmakers.com/Bachelder_Master_Gunmakers/Welcome.html


Wild Skies
Since 1951