hawg haggen is right. i had to fit the 45 acp cylinder to the uberti. it well not fit the pietta. i also had to fit the 45lc cylinder to the pietta. i see no reason to to drill out the firing pin hole. seems like a good way to ruin a nice firearm. i also put a 5 1/2in colt nickel platted 3 gen barrel in the pietta. i still need to have the cylinder's platted and the back strap and trigger guard. I'm doing the same thing with the uberti. but i used a 4in barrel from said company. and using thunderer grips. when the guns are finished. I'll post some pics. they well be two unique 1873's to say the least.