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What's the story on the Achilles? Tank Destroyer? It looks like it has a Sherman transmission case. That's a mean looking bastard! Great looking build too.
Quick & dirty:
The vehicle was more commonly referred to as the M10/17 pounder. There seems to be some question as to how widespread the name 'Achilles' was during the war.
Basically, it was an M10 (late pattern) that the Brits modified by swapping the 17 pounder in for the 3" naval gun standard to the M10. The 17 pounder was considerably superior ballistically (anti-armor performance) to the US 3" or even 76mm guns. So like the other M10s, the vehicle was a tank destroyer on a modified Sherman chassis. Biggest drawbacks were of course the lack of armor and the open top. Plus, because of its manual traverse and rather poor balance, the turret was on the slow side. This was even more problematic when the vehicle was astride a slope. Traversing the turret up the slope was quite a bear, apparently. One final bit: The collar near the muzzle brake was installed to offset the counterweights at the rear of the turret which were themselves necessary to balance out the immense weight of the original 3" gun. As I said, balance was an issue with the M10 turret, in all incarnations.
And Jim, nice build. At first glance, I thought I detected a faint black camo overspray. Upon closer inspection, I'm not sure if that is the case, or if you have just varied the coloration of the hull. Either way, I like it. One of these days I'm gonna have to build the kit I have in the closet.