If you guys who collect depth charges need a replica firing pistol for them, you might want to check out the newsletter from the USS Slater (DE-766) a museum ship in Albany, NY.
They had a plastics manufacturer turn out a bunch of replicas for their depth charge rack, and the maker has some spares.
In any case, it is an interesting site which showcases the weapons systems aboard a WW2 ship.
For the main site:
For the newsletter with the DC pistols click on the January 2009 newsletter and go down near the bottom: