Huh? Talley Lightweights on a rail? You’re thinking of something else.What a misnomer though--lightweight. I'm using them on a Marlin .45-70 with a Leupold scope on a rail that is "dovetail" spec. Had to use an adapter to get me from Picatinny mount down to dovetail. Have had no issues. Scope returns to good zero and have never had the QD loosen under recoil.