FYI the trijicon tri-power comes in 2 styles, as to if this will fit or not. The style that is a tube over the objective will thread up to this. The other syle, looks like a ball that was sliced in half and had then again, will not work with this. Look on trijicons web site for the pictures and you will see the difference. I was able to get the the problem corrected by Trijicon for free and very fast.
Pros: Screws in easily.
Cons: None
This review was written in the old system and had content requirements that are different than reviews written today.