To the OP the search function on the forum will not give you as many results as Google. You will usually get better results from a Google search as Fenway did.
Here is how to use Google to search INGO
Go to google and enter in what you are searching for, example xs big dot then the word site with a semi colon (site: and the web site domain name (ingunowners.com) so what you would enter would look like this:
xs big dot site:ingunowners.com
That is how Fenway got the results he posted. This formula will work for any site you want to search with Google. Good Luck with future searches.
I put one on my 340Sc and really like it. Of course it's great for nitetime, but I find it's really easy for me to pick up the dot in low-light situations.
Most say they aren't for target work...read the instructions all the way thru when you get a set...