My Firearms Assembly I, the NRA Guidebook to Shoulder Arms, and my copy of Gunsmithing Guns of the Old West both have complete instructions for the '73. The Gunsmithing book has Uberti specific instructions, with notes on originals as well, while the old NRA guide has instructions for originals only. They are slightly different. I highly recommend the Gunsmithing book, 2nd Ed., by David Chicoine. It's not too pricey, and it helps with lots of different guns.