I've had a PT1911 Stainless since 2008. I guess the older models had Heinie straight-8 sights like mine, and the most recent ones have 3 dot Nowaks. Great gun with around 4000 rounds thru the gun. The only problems I've ever had with this gun are: (1) the plunger tube started to work loose. but I restaked it. (2) It will not feed JHP ammo from CMC .45 magazines. But feeds everything from cheap .45 magazines I bought from DPMS. Otherwise, no problems with this gun. And I would not hesitate to buy another.