I got my trigger in, it didn't work. I measured twice and cut once but found it is 1/8" to far back. I inletted a little more and moved it up, it fires the lock set but not unset. I think it needs to go a little deeper. I found prussian blue is a much better inletting marker than lamp soot or inletting black.
The first one I put in a TN rifle worked perfectly the first time I tried it. I am going to look at its sear/trigger bar orientation today and see what is different between the two.
I have a # 7 optivisor lens with a 4" focal length, I like it for detail work but it strains my neck if I use it too much.
I decided to order a new lens with longer focal length but found each lens is $32, almost what I paid for the whole rig. I noticed the chinese knock offs on ebay for $19 shipped, they come with 4 lenses of different power, I took a chance and ordered one, mainly for the lenses. When it came in I was surprised by the quality, it is almost as good as an optivisor and the lens are just the same and will fit an optivisor.