We've done a number of them.

by Hoot , Diversityville, Liberal-sota, Tuesday, May 31, 2016, 07:09 (3101 days ago) @ stonewalrus

If you can take one apart, you can do the part swap. As mentioned, how well the parts fit up is another story. Ruger changed the profile of the frame where it meets the grip frame when they introduced the Bisley. Earlier models like yours won't really match up very well. That said, it usually isn't very objectionable.

The hammer profiles are different. The BH hammer will work in a Bisley frame but there will be a large gap at the rear and the hammer spur will sit significantly higher.

The triggers are a straight out swap. The Bisley has a deeper curve and sits further back in the trigger guard.

I would buy all the Bisley bits needed rather than mix-n-match. But, that's me.