Recently purchased a 220F. Decided on a Nikon Slughunter 3x9x40 BDC. Looking forward to tinkering with the BDC feature. On the particular scope I received the power ring is very stiff/difficult to turn. I own scopes from Zeiss, Leupold, sightron and Redfield and none are like this. I'm exchanging the scope for a replacement of the same model. Has anyone else experienced this particular issue? Is this what I should expect?