The only thing that I would add is to emphasis that a competent gunsmith should install a Timney Trigger because sometimes certain triggers require that a stock be modified a little bit. This was true of my Remington BDL SS DM where I had a Jewell trigger installed. I'm not sure about the Rugers, but just make sure.
I advise you to send a little more money to a gunsmith to ensure the safety of not only others, but yourself.
Remember, safety is always #1
Zachary