Wedgetail,
Yeah the TG should nestle in nicely since its pre inletted. Still, as you smoke the metal in, if you’re not aware of the geometry with frequent checks, you can start to get it off kilter. This is a case where it’s possibly easier to drop the metal into a solid block than a pre inletted stock since you have a better reference for square and true. This is another reason it’s good to leave plenty of meat in the channel, if you happen to get the TG off slightly, it leaves you with plenty of wood to prevent any gaps as you drop the barreled receiver in.