I have multiple heritage 5-25x scopes, most I bought new, two I acquired second hand, and bc I worry about the warranty issue, I make sure they are cleaned and maintained on the regular. If I’m just going to the range it’s not a big deal, but after matches I am especially diligent about about removing debris and checking for any issues with the turrets. As I’ve found out, that is really the most likely issue as long as proper torque values on rings or mounts are maintained.
I will loosen the tool less adjustment, back out the set screws, remove turrets, brush away any sand or dust that gets under the caps, and use a vacuum to pull out any other debris that might have gotten into the mechanicals. A small amount of synthetic grease is applied to the oring helping to maintain sealing, and give smooth (for mtc type) clicks. I also removed the batteries on all my units just so there is no chance of corrosion on the terminals.
IMO the price is fair, provided it’s in relatively good condition and comes with the PR branded tenebraex caps. At most your getting TT quality glass for little more than razor cost. But it comes at the risk of not having a warranty to back it up. Personally I’d be fine as long as the scope doesn’t have bad ring marks and seller can verify no tracking or focus issues before buying.
And yes I heard of others having issues with these scopes in extreme cold, but as far as my experience, I’ve ran mine in single digit to triple digit weather during matches, wind blowing snow sideways to dust and sand swirling, and not had any issues. I credit that to how well they are built and the level of maintenance they receive.
I abosolutely love my heritage scopes and would only consider selling for ZCO or TT, both of which are double the cost of what your looking at spending.