When I did my pre range inspection, I found the set screw next to the elevation adjustment screw was loose, I tightened it up.
With my first shots, the gun was shooting 3" low at 7 yards. I had to do four complete turns on the adjustment screw to raise the POI up. Then, I did a full turn on the windage screw to move the POI 1" left.
For the rest of the session, things seemed to be normal. Then, when I got home, I noticed the notched sight blade appeared loose. The sight itself doesn't move, just the blade. If I move it with my finger and release it, the blade will move back to it's original position.
I can see a spring under the arm the blade is attached to, but it doesn't seem to have much tension. It looks like the spring extended when the set screw raised the arm so much. It seems to hold it's setting, just doesn't have a firm feel to it.
Is it possible my front sight is too tall, causing me to over extend the rear sight height? Or do all Mark xx rear sights feel that way?
I'm not compulsive about it. If you guys say that's just how the gun is made, I'll be OK with it.
The situation could change tomorrow. I ordered a front fiber optic sight from Amazon for my old eyes. If that sight is shorter, I will wind up lowering the rear sight, and restore tension to the spring. That would be nice.
I know Ruger will make good on any problems, but it's always better to not have to send the gun for repair.