I've had both these guns for 2 or 3 years now and have done some tuning and parts replacement on the 1851 (Pietta). Sights, hammer, bolt spring, adjust mainspring, replace nipples, and install action shield. The Uberti 1858 has been good right out of the box. Replaced nipples on it. Both guns are very accurate off of a rest and both run basically trouble free. For quick single hand shooting I'll feel better shooting the 1851 but for two hand target shooting I do better with the 1858. The grip seems larger, easier for a two hand grip, sights seem better for my eyes and the trigger is lighter so I can get my shot off when the gun is waving around at the proper instant when I'm on target. I was just wondering how others feel about these two and any secrets to improve handling.