Thanks for thinking of me!
I'm happy with the Trainer stock at this point.
I haven't figured out what I need to do exactly to making it a "perfect" fit.
B/C of the curve or dip in the Trainer stock, I might find out that I didn't need the cantilever rings to raise it up higher.
The rail I have limits the placement of the rings, so I might go for a different approach in the future.
I'm having so much fun with it for now, I'm not in a hurry, since it is working for me, but it does have a different "feel" than the RPR & 10/22.