Timney Trigger~ Ruger American Rimfire (T640R)Self contained, 100% drop in trigger is ready to install in your Ruger American rifle for an exceptionally smooth, crisp, trigger pull. Pull weight is factory set at crisp three pounds and you can set it yourself to any pull weight you'd like from 1. 5 to 4 pounds. Lightweight 6061 T6 aluminum housing is anodized for extra durability. The trigger is CNC machined on the most cutting edge robotic machines available. The sear is EDM cut and Teflon nickel