Hi Danny
I've a Militia the same as the top one of the three you linked to, I suspect the owner already knows that it's in Hillers guide
Hillers piece
The break barrel with the lever release also looks like a gun in the guide, A Marco or another very similar (Copy?) Roland air rifle..
Info on Marco
The Roland air rifle..
Pic
And info
By the way, I have an old rifle that I thought was a Diana mod27 but there are subtle differences!!
Anyone know for sure? I found a couple of pics (Two different rifles) that were identical to mine but there was no info, Strangely, Both were on auction sites!!
Pic 1
Pic 2
Pic 3
Pic 4
Pic 5
Pic 6
Pic 7
The piston seal had been converted to O ring by a 'Gunsmith', It had completely the wrong sized o ring fitted and there was very little compression, An Ox spring was fitted and there was enough grease applied top cause an oil shortage in the middle east!!
When I fitted a correct O Ring the me doubled from 3ft lbs to 6ft lbs!! The breech seal seems OK but there's a loss of power through it as I suspect the detent lockup needs a stronger spring fitting!!
Cheers, John