I just mounted a Tasco Silver Antler target/varmint 6 X 24 X 42 scope on my .17 455 using "air gun" rings. Perfect fit, compact and they look good. No idea what make they are (took them off of an air gun LOL). I have yet to get to the range, but the Phantom springer air gun had more recoil than the .17, so they should stay put. I likely did not pay more than $15.00 for them. I think they call these "medium" height, and this is a big scope but gives me about 2mm clearance on the objective end. This rifle has no iron sights.