I have recently bought, purchased, and installed the RTK trigger for my Ruger LC9. I have not fired the pistol yet with the new trigger but I can see and feel a difference from the factory trigger and the new adjustable trigger during the dry firing during the install. Install was a do it your self type of thing and worked as per the instructions on the RTK web site. Here is where I purchased from:
When I get a chance to go shooting, I will report back on the trigger mod to let you know how it worked. I couldn't afford the new LC9 with the SR trigger...and I didn't want to sell this one to purchase a new one. I'll report back.