I'm into Coolfire as well, and I like using the Ring's blue magazines to duplicate gun weight. I have the yellow replacement plastic barrels, and I like those as well, but man, that Coolfire plus weighted blue plastic mags gives me a combo of safety and fidelity that I love.
I will say that Gabe White's dry fire guidance is the most thoughtfully, purposefully safe dry fire technique, independent of technology, that I've ever encountered.