Thanks for the clarification, Mal.
In terms of getting anything for them, I would like to make a couple suggestions on what "the best" to get for them is (at least for a target grade gun, they are fine as is for plinking, IMHO):
Titanium internal parts from Power Custom.
Fajen Thumbhole target stocks (yes, there are still some available, you just have to hunt around).
Green Mountain Barrels.
If you are just building a plinker, you have GOT to tyr out the Houge Soft rubber Stock.. it is too cool. I'll get one for my magnum as soon as they are available.
If you can't afford or get on the list for a Hearn Custom, I would recommend Clark Custom Guns in LA as a good second choice for custom work.