Grip frame, hammer, trigger & the B screws, for a "straight" forward swap.
The hump can be removed from the bisley hammer if you want a bisley hammer, a custom modification that is often performed.
A Super, Montado, or standard Blackhawk hammer, as desired.
The "B" back side screws don't have to be swapped, only difference is the hex head vs the slot head.
The Bisley trigger can be used with modifications, the trigger is slightly more curved and a little longer than a standard trigger. If one wants these characteristics then either the hole in the grip frame needs to be lengthened or the body of the trigger needs to be shortened. FWIW, I have done trigger shortening, IMO, it's ok, and worked out on the custom build, however really see no reason for it. As for opening up the Grip Frame, I have seen this performed and asked myself,,, WHY? :roll:
My suggestion here is just buy a standard trigger, it's easy, cheap & works.
Sell the pulled Bisley Trigger with the Bisley Grip frame.
The "Huntington" Bisley modification has been discussed with a tracing of the difference between the original vs modified grip frame, it is ever so slight with the consensus being it is removed material from the grip frame, back of the trigger guard and grip panels re-fit.