I’ve owned a couple of the 1.75-4s, still have one. Also have a 4-12x40 AO that’s been on several rifles. No issues. My son has a 4-12AO like mine on a 77/22 Target model; been there for a long, long time. When I bought a rifle for my young grandson, I put the 3-9 on it, figgering it was only a matter of time before he dropped it out of a tree. Not yet, but it’s only been through three seasons. Three bucks down so far.
Perfectly usable scopes at a really good price.