Here is what I have done uptill now.

Added a silver recoil pad to the donorgun and cut the barrels to 26" length.

The old chambers and forcingcone are reamed out of the breech about 165mm long, had to do this in two steps to keep some walls in the old barrels.

To mount the sights some flats are milled out on the top of the rib for the sights to be held into place.

Two adam&bennet 458 barrels are chambered and waiting to be turned down to size.