Hi guys,
clearly, the Tufenk is the father of a lot of firearms from Maghrib (Algeria) to Middle East (India, Afghanistan) and Central asia (Uzbekistan, ...).
Norman have a sort of arabic Abou-Fitila (the upper) and maybe an indian torador (the lower) as may be yours.
They are tribes guns with usually indian made barrel.
See my 2 guns: one is arabic Abou-Fitila and the second, very near is Indo-arab (Malabar coast).
http://blade.japet.com/10-peninsule.htm
http://blade.japet.com/B-indoarab.htm
My website is in french:sorry, no one is perfect...:-)))
See U
Louis-Pierre