You asked is there are 9mm versions. Yes I have an SW pro 9mm and it is dead nuts accurate. Parts come from the custom shop but it is assembled on the production line.
You asked why is the trp a favorite. Not sure about every trp, there are a few models, but mine which is newer has serial numbers on all parts. It is hand built in limited runs in the custom shop. It is so tight I am surprised the gun runs. Accurate, ohh ya and It runs like a freaking raped ape man. Soooooo accurate.
Here is the rarest of them, full rail, operator tactical model, oversize ambi safety, with bull barrel and match trigger and fiber optic sights with adjustable target rear and sandpaper grips and deep serrations. First 10 times I shot it it made my hands raw, the traction is crazy.
This one is going in the grave with me. Pure man shit right there. I don't care who you are, or what you opinions are, this is in fact the most bad ass 1911. No ladies, light weight, short barrel, convenient, polished carry piece here. This is intended for serious use and not being a safe queen. I freaking hate fixed sights, different ammo, just turn a screw and aim dead nuts.
My local high end range has Weston's yada yada yada, they are all ok, sights suck and you have to offset with different ammo and ranges. Imagine a rifle with no wind age and elevation. Even the regular TRP is not the same as this bad bitch. I shot them all, I can buy any one I want, once I got this the Wesson's and Browns that were on my list simply fell off. Why bother.
The pics suck, google "trp full rail operator" for better pics, my phone blows.