An outlandish scenario

[Patrick]

What on earth is mounted on that pedestal?

A silencer. For a tank.

[Fuel Fire Desire]

A silencer. For a tank.

DEUTCHLAND!

[DeSchaine]

And the US.

For a modest price, you too can build your own tank gun suppressor.
https://apps.dtic.mil/dtic/tr/fulltext/u2/a241063.pdf

[Kpkimmel83]

The original construction of the device for its intended use would of have to have been a suppressor, not a car. So the fact it was never form 1'd with a serial from origination makes it a non transferable, non NFA item. You are now in possession of an illegally manufactures suppression device.

[Fuel Fire Desire]

The original construction of the device for its intended use would of have to have been a suppressor, not a car. So the fact it was never form 1'd with a serial from origination makes it a non transferable, non NFA item. You are now in possession of an illegally manufactures suppression device.

This is probably the correct answer.

Is this why we don’t see the oil filter suppressors anymore? IIRC the original idea was to just have the 1/2-28 thread to oil filter adapter be the registered component.

[nmuskier]

A silencer. For a tank.

That is an M109 howitzer.

...and the largest phallic symbol I've ever seen.