So, the illuminated TMR’s main stadia is .10 mil thick. The non-illuminated TMR is .05 mil thick. Most precision reticles such as the PR2/3, Mil-XT, etc are .04-.03 mil thick. The SCR seen in the Steiner T5xi 3-15 I had was .05 mil and seemed just fine.
Something to consider if all you’ve seen...