My prior life was as a CAS gunsmith. I used Brownells screwdrivers. I found the closest driver tips I could find to the actual screw size and then further ground them to a perfect fit. the reason I did this, was Uberti, Ruger, USFA, ASM, etc all have sightly different thickness of screw slots. Plus, If I twist one (frequently) or snapped one off (once in a while), just called Brownells and got a new one (free replacement).
If you go the Brownells route, the longer, magnetic handle will drive you knutz. Skip it. Go with the non-magnetic, short handle. I think Brownells calls it an LE handle. I never broke one of those.
I'm currently doing my world famous impression of a Couch Patada so I'm not near the shop to give you the specific driver numbers.
Coffinmaker
PS: If your not doing a lot of work or really abusing em, the Grace USA drivers are really nice.