I would go with a 2 stage RRA , about 90.00, or if you have more funds , jewel, timney , giselle all make great triggers. A 2 stage is a much safer way
to get a crisp breaking trigger in a semi auto. Polishing the pin bores enough
to get the bluing out (a q-tip and compound in your drill) and a change of
springs will help a lot no matter single or 2 stage.
