Pietta does both a transfer bar and a nontransfer bar model. I don't know about the cylinder pin safety described above, but the transfer bar safety is modeled after the Ruger, which model also comes with the Ruger style plunger and spring handspring set up that is far more reliable that the original Colt. Its "Evil Roy" slicked up model does not have a transfer bar, but I suspect it has the plunger hand spring, since it is set up for SASS. Both have the crossbolt pin release mechanism.
P.S. I have a Pietta transfer bar model "in jail" right now in .38/.357. No it's not authentic, but I'd rather load 6. I'll probably buy one without the bar in .45LC somewhere down the road, just because. Colts is purty, but pruty expensive too.