I've owned several Ruger revolvers and loved them. Just got my first GP-100 and am having trouble with the trigger not returning after pull. Have to nudge it forward again with my finger. Doesn't happen every time, only once in a while. I e-mailed Ruger and they said to send it back in. First problem I've had with one of their guns but I'm sure they'll make it right.
The trigger return spring fits in a drilled channel. I bet the channel has a metal shaving or a burr that is causing the spring to bind up. Removing the trigger group and checking the spring is about a ten minute job and takes only one screw driver to remove the grip panels.