Hammer is altered for hammer block safety. Hammer stud is polished flush with frame. Hammer stud has no spanner wrench cuts. Joint pivot diameter has been increased. Mainspring is shorter and altered shape.
Screw threads are different.
Strain screw location is higher on grip strap. All loads fired from sand bag rest. These are a close approximation of Ira Paine's .44 Russian target load from the last century. These loads were assembled in the few antique Remington balloon head cartridge casings I have managed to squirrel away because these old cases have a slightly larger powder capacity than modern manufactured, solid head cases, enabling me to comfortably use 22 grains of black powder with minimal powder compression. We fired over 200 rounds of factory made and hand-loaded smokeless and black powder ammo, and the gun performed extremely well throughout our testing.