The .357 will become a .41 magnum with a 5.5" barrel...
and a second .41 special cylinder...
and an Alpha Precision front sight.
Very "simple" conversion (piloted rechamber not linebored - its already a great shooter - factory ruger .41 barrel cut short and spun to take the warning off)
They look better
If I shoot it til its dirty, its a little easier to pull out. (Keith's original design intent of the no 5 head - as well as operating it with gloves on, IIRC)
Might be a little tighter fit.
here's a reach if you just want to convince yourself to buy one:
Belt mountain base pins can't spin in the frame like stock single six and midframe base pins can. This eliminates the chance of grit ingestion wearing your frame hole oversize.
On a full size, the no 5 base pin can be removed entirely without removing the ERH.