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I have put the yellow reduced power springs in 4 AR's now and while they are not even in the same leauge as my Giessele they did help. For what ever reason I have gottn the best luck with trigger groups from Model 1 Sales as far as being creep free and clean breaking. I have done two M1S kits for buddies that we dropped in the Yellow springs and they both turned out excellent. My DPMS trigger groups definatly improved, but had a small amount of creep and grit.