Browning BAR 1 Piece Quick Release Base Gloss Finish by LEUPOLD MOUNTS & ACCESSORIESLeupold's QR mounts allow you to remove and reattach your scope and return to within 1/2" of the original point-of-impact. The patented lever mechanism and machined with precision tolerances and engages the steel base to the ring and pulling it down and forward and locking it into its “zero” position. You get ease and convenience and and field-proven and repeatable accuracy.