WOW! Either I've been sleep walking the last few months or I'm just a dope. I spoke to the dealer that is selling me my PT145 this morning, and he said he spoke to Taurus about the serial number of the gun I was getting to make sure it was a 3rd generation. The guy from Taurus said it was not a 3rd generation, but actually a 4th generation model. He said all the models with the accessory rail are the 4th generation. I had no idea. I don't remember seeing any threads or anything saying that there was indeed a 4th genration. This is a complete revelation to me. Did anyone out there no this? And if so, are the other differences other than the accessory rail?