I always used Buffs in my Limited Guns. I could tell a noticiably softer "hit" when the slide hit the buff instead of the frame. But since they do remove 0.1" of the slide's stroke, they can cause feeding and ejection malfunctions - in some guns. For me, if putting in a Buff caused malfunctions, that told me some tuning work was in order. I tuned all my Limited guns so they'd run 100% with 2 Buffs. And I even had one gun that was 100% with 3! That was a soft shooter. be