My dad has just brought a second hand ruger m77 and it came with a leupold mark 4 3.5-10x50 M1 illuminated.
After searching the web I am unable to find a leupold mark 4 3.5-10x50 all of the ones I have found have an objective of 40. Also I looked on leupold's website and they have a counterfeit page and some of the things match up. Another thing is we were at the range today and when I looked through the scope it just did not seem to be as clear as other scopes, this is what made me think something was wrong.
If possible can you post some pictures of your genuine mark 4's please or email me the pics to firstname.lastname@example.org
I will try and get some pictures soon although I don't know when I'll see it next.