Thanks Greadbeard. The thread is entitled "10-22 scope needed" and he specifically stated 22 rimfire ( unless I'm loosing my comprehension). It is about 8 threads down from this one.
I have heard that term used referring to spring operated air guns but not rimfires. I'm not a air gun owner, since my daisy pump anyway 45 or so years ago. So no first hand knowledge on this.
I guess either he misspoke or I misunderstood. Thanks, Byron