I have an older 4x Burris scope that seems to get fogged up in colder weather. There doesn't seem to be any type of rubber seals where the various threaded parts meet, tell me that perhaps the nitrogen has leaked out.

Generally what does it cost to have this done.

Call Burris, they will probably rebuild it for free.

Ditto. Burris has excellent customer service.

I sent Burris 2 weeks ago one of their older scopes that needed work. Tonight, UPS delivered a brand new Burris scope to my door.....in sealed box. I will thank them tomorrow.......but cannot thank them enough. What amazing treatment!!