I am assuming the last round fired? Hope so. break the gun open, cock the hammer, point in a safe direction and pull the trigger. If nothing happens take the upper off the lower, try an put a thin bladed flat screwdriver into the space between BCG and frame and see if you can force it back some. As always I remain perplexed, in several dozen of these guns built or bought I just dont have the same problems as others face. Of course I don't believe parts is parts but whatever.
