Well I don't know if it is worth discussing but I would suggest if you look at the end of the 19thC you will find that the Kabul National weapons making arsenal not only leaked like a sieve but that quite accurate weapons making machinery mysteriously vanished and resurfaced in what we would term back street workshops which to thus day turn out reasonable modern copies. I recall a good discussion on the Machin Khana factory on library some time ago.
khanjar1 poses a question looking for picture evidence in Kabul chicken street main souk of evidence of the hundreds of old style pistols I claim to have seen there a few years ago...which if you know the place you would certainly not want to be seen taking photographs down there. However I found various clues on the web and one in particular from just one small shop in the same souk complex with a lot of weapons in it... there are hundreds of such shops in chicken street just like this ...I also show guns from Darra down the Khyber on the Pakistan side.
The Martini Henry pistol is interesting and a good explanation sits at
https://www.youtube.com/watch?v=zTvxFNRLbiw 