Wandering back a little bit toward scopes, but not Redfield.
I recently bought a Vortex Viper PST-3151 at the Tulsa show.
When I got home, I realized the Power Adjustment Ring was really hard to turn.
I sent it to Vortex under their We Got Your Back warranty and described the problem.
Within one week, I received a brand new replacement.
They paid shipping both ways and no charge to me for anything.
Great Warranty!