Originally Posted by
nvubu
Yes distinctive and still recognisable today. The photo doesn't have a title, just a number as it's description, but I think that they are the gun butts for testing the machine guns.
I'd hazard a guess that your challenge is a fly in community in the USA?
Thanks a gun butt makes sense.
Fly in community; perhaps
private: certainly
USA: no, it is east of London
Below the only other photo on the net found under same location reference:
