I'm not sure why (beside scale-like draping) anyone would opt for metal tracks on anything above the Pz III/IV. I have the original tracks on my Tiger I from 12 years ago and the only thing that's worn on the sprocket is the paint off the teeth. Keep it stock weightt and don't run your tank on concrete and it'll be fine for a long time.

The ABS roadwheels aren't going to wear, and adding metal to muzzle brake is just going to put more strain on elevation. Truthfully, I wish they never gave to pressure and kept all barrels styrene. Yes it takes some extra care to assemble and alleviate the seam, but the paint sticks better and there would be no need to alter the elevation arm. Again, the original Tiger, styrene barrel, no need to jam the clutch or add a metal arm. It worked flawlessly for all these years.

On my JS-2, I needed to make a metal arm, seal the clutches and eventually add micro switch stops all because of the aluminum barrel (which is sheding paint). Same with the Panther and IV. But my M4 and Tiger, no issue whatsoever.