The Williams Fool Proof sight for rimfires is FPGR and attaches to the grooves for the tip-off scopes and is more rugged than it looks. Here's a pic of mine on my Browning BL22.
One click of adjustment gives 1/4" change of point of impact at 100 yards. Note that mine was tilted a little to the left - I cured that with tightening of an adjustment screw. I think you'll like it.