Is it pinned or are the threads crush fit? Crush fit may be a problem. Pinned not so much. If it came off the gun, it should be able to go back on. You don't need a gunsmith for that operation. You need a few tools any man should have in his work area.
And if you need hernia surgery no need to see a Doctor. All you need is a sharp pocket knife and a good bottle of whiskey.
