bookdoc, since you are doing extensive research I thought you may find interesting a copy of the email I recieved from Mueller. I believe that Rich is the main person there. I have the 4X16X50 glass etched that they refer to in this email . So far I had it on a Trail XP and NP, no problems yet, but still to soon to recommend. Regards
Hi Jim,
Either of our 4-16x50 models are glass etched, have been tested and are rated for spring piston airguns.. Other glass etched reticle models may work but they have NOT been tested, therefore we don't recommend them for that purpose.. Actually, there is only one other glass etched reticle model that is parallax adjustable (which is basically preferred for Airguns) and that's the Eraticator but it has not been fully tested for springers.. All scopes that "do not" have illumination have wire reticles.. During our testing, we found the wire reticle was the first thing to go due to the back/fourth "spring" action.
Thanks
Mueller Optics