[leigh kitchen]

Looks like you're right, and the aluminium sections of the legs look newer than the brass and have threaded sections at both ends.
Interestingly there are a few deliberate little cuts and drill holes on the brass.
Good job I bought it as a man cave accessory rather than a unique, one off, REME workshop extemporised SAS jeep machine gun mount.
It was an evil bay purchase so I'm probably lucky it was listed as the former rather than the latter.
I'll give the brass work a very light clean and find a lamp to put on top of it.