Depending on "which kit" you are talking about the lock could be a Chambers, Davis or L&R.
Ditto the triggers - Davis or L&R.
Again, depending on the kit I find their other furniture kinda "generic" so ok if you want to build a Lancaster for example, but not if you want to build a specific "Lancaster builder".
You would have to ask specifically what barrel they are going to send you. I have bought "left-overs" from them and know that they have got Goodoien and deHaas barrels in the past.
Others just based on length and profile could have come from Oregon or Burton and they definitely use a lot of Colerain's "off the shelf" with Rice being a special order at additional cost.
With most of the rifles TVM is doing now, it's probably a Colerain unless you ask for something different.