The Leupold QR Mount promises repeatable accuracy. Super close machining tolerances are at the heart of this patented lever mechanism. By turning the lever forward, an eccentric on the lever shaft engages the base of the ring. This pulls the ring down and forward on the base, locking it solidly into its "zero" position.
Mauser FN Also Fits Browning FN .264 through .458
Harrington & Richardson 300, 301, 330, 370 Pre-1973
J.C. Higgins Pre-1995
Mauser Mark X
Parker Hale 100, 1100, 1200
Sako Round Receiver