The op, nilo52, has not advised what brand of gun his Dragoon is and how old it is (date code on the frame) which might help someone to help him.
In a quick look at VTI Gun Parts it looks like there is interchangeability on some screws between Dragoons and Walkers.
Some of the old Walker replicas have very small heads on the trigger and bolt screws through the frame sides. If I recall correctly this also applies to some early Dragoon replicas. The devil is in the details.
Also, since nilo52 said some screws (not all) were damaged it might be worth trying to help those screws by tapping the buggered metal back into position, reshaping the slots, etc.