. . . As others have said, there just isn’t enough there in the original image to definitely identify the model variation or his problem . . .
A couple did welcome our new member, but I did not, but better late than never. Welcome to the Forum.
Have to disagree. The only long trigger/hand spring guns that S&W ever made were the first 51,126 Model 1903s. I know of no other model with that spring.
Everything is the same, except for the fact that the OP's gun has the hand removed. I originally assumed that the OP had done that, but maybe that is the part missing and causing the problems with the action not working?? Without the hand, I assume that the trigger will not rebound properly.