Mr. Wolf, the pistol was in it's proper mode when it was in pieces
RG's are about the only make/model floating around out there that I could legitimately say are actual *hazards* when brand new. Even the ring of fire semiautos aren't as dangerous. I've had a few in my hands, they're undersized for the materials and assembly methods used.
Now, if you're assembling it to learn how a revolver works, then more power to you. I don't think you've got all the parts... but a handy thing to check is that the lug isn't sticking in the cylinder. IIRC the lug is a direct part of the trigger and it wouldn't take much to jam it into place.