Turns out that RSA I asked about before, is made by a company right here in NC in a city I've been too several times. Galloway Precision, they have a lot stuff on their site along these lines. After I found out it was a small local business I had to show support. They use ISMI springs. Oh yeah, its 20# . I will test it later and see how it handles S&B FMJs.
So here are a couple pics. Sorry the quality isnt the best, shrinking for this forums requirements I distorted them. Its built a lot heavier than the stocker, and the tip is polished stainless to match my polished pins, and slide stop lever.
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Fired a few rounds, couldnt do much. But it functions perfectly, and seem to have took some of the jolt out of the recoil
Looks like a good setup... 8)