The set:
LionMarc Model Designs/Passion Models have released this replacement metal barrel designed for the Tamiya Panzerjäger "Jagdtiger" Sd.Kfz.186 Frühe Produktion (Kit #35295).
The set consists of a single finely turned brass barrel with the muzzle drilled out and rifling included and requires no cleanup at all before fitting to the kit.
The base of the metal barrel includes the small notch as per the kit plastic barrel which is designed to fit inside the kit gun housing with the barrel dimensions matching available data.
Conclusion:
This is the simplest of barrel updates for the Tamiya Panzerjäger "Jagdtiger" with a nicely machined barrel with rifling and no alterations to the kit required to add more detail to the kit gun barrel.
Highly recommended
Thanks to LionMarc
Model Designs for the review sets.