Look into the Ghost Trigger system. I have them in my Glocks and I know they make them for the SR series Rugers. Pretty simple and quick to do in a Glock...I bet the Ruger is just as easy.
"They're on our right, they're on our left, they're in front of us, they're behind us; they can't get away from us this time."
Chesty Puller, USMC, Chosin Reservoir, Korean War
"You cannot exaggerate about the Marines. They are convinced to the point of arrogance, that they are the most ferocious fighters on earth - and the amusing thing about it is that they are."
- Father Kevin Keaney, 1st MarDiv Chaplain, Korean War