Just mounted the VX-2 3-9x40 in Med LW Talley ext. rings on the Roberts. I was concerned that the .500" rise off the front ring wasn't going to be enough. It is and feels right.
Looks better, too.
Before and after.
Before and after.I like the 4200, but it's almost 5 oz heavier. The LW Talley's are several ounces lighter than the steel Zee rings. The VX-2 glass is about as good and I can mount it farther forward due to longer ER. You can see the difference comparing the first two photos. The VX-2 power ring is almost over the bolt, the 4200 power ring is well behind the bolt. The gun even feels lighter.
DF