Yours is right around the time Uberti changed how the firing pin extension is held into the bolt head. Look at the left side of the bolt around the forward link pin. (The one in the bolt.) If there is a small metal plate in there you have to remove the link pin and pull the plate out to release the bolt. If there is no plate and only a small hole in the bolt it is just a straight pin and should come out with little problem. Sometimes they get a little rusty or dirty, but you should be able to tap it out with a punch and small hammer.